diff --git a/src/Application/UseCases/ImportAbcFile.php b/src/Application/UseCases/ImportAbcFile.php
index 9aa529f..a7e30be 100644
--- a/src/Application/UseCases/ImportAbcFile.php
+++ b/src/Application/UseCases/ImportAbcFile.php
@@ -3,6 +3,7 @@ namespace XaiCorp\AbcParser\Application\UseCases;
 
 use Enzyme\Axiom\Atoms\StringAtom;
 use XaiCorp\AbcParser\Domain\Core\Collection;
+use XaiCorp\AbcParser\Domain\Core\TuneBuilder;
 use XaiCorp\AbcParser\Domain\Core\TuneCollection;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Builder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Context;
@@ -12,19 +13,19 @@ use XaiCorp\AbcParser\Domain\Modules\Interpreter\Interpreter;
 class ImportAbcFile
 {
     /**
-     * @var Builder
+     * @var TuneBuilder
      */
     protected $builderTemplate;
 
     /**
-     * @param Builder $builderTemplate
+     * @param TuneBuilder $builderTemplate
      */
-    public function __construct(Builder $builderTemplate)
+    public function __construct(TuneBuilder $builderTemplate)
     {
         $this->builderTemplate = $builderTemplate;
     }
 
-    public static function create(Builder $builderTemplate = null)
+    public static function create(TuneBuilder $builderTemplate = null)
     {
         $builder = $builderTemplate ?: new Builder();
 
diff --git a/src/Domain/Core/Collection.php b/src/Domain/Core/Collection.php
index ebb4553..a7fc590 100644
--- a/src/Domain/Core/Collection.php
+++ b/src/Domain/Core/Collection.php
@@ -17,6 +17,14 @@ class Collection extends BaseCollection
         return array_reduce($this->items, $callback, $initial);
     }
 
+    /**
+     * @return \XaiCorp\AbcParser\Domain\Core\Collection
+     */
+    public function unique()
+    {
+        return new self(array_unique($this->items));
+    }
+
     /**
      * @param \XaiCorp\AbcParser\Domain\Core\Collection $collection
      * @return static
diff --git a/src/Domain/Core/MultivalueAttribute.php b/src/Domain/Core/MultivalueAttribute.php
new file mode 100644
index 0000000..fb58de8
--- /dev/null
+++ b/src/Domain/Core/MultivalueAttribute.php
@@ -0,0 +1,80 @@
+<?php
+
+namespace XaiCorp\AbcParser\Domain\Core;
+
+class MultivalueAttribute
+{
+    /**
+     * @var \XaiCorp\AbcParser\Domain\Core\Collection
+     */
+    protected $data;
+
+    private function __construct()
+    {
+        $this->data = new Collection();
+    }
+
+    /**
+     * @param string $item
+     * @return \XaiCorp\AbcParser\Domain\Core\MultivalueAttribute
+     */
+    public static function create(string $item)
+    {
+        return (new self())->add($item);
+    }
+
+    /**
+     * @param array $items
+     * @return \XaiCorp\AbcParser\Domain\Core\MultivalueAttribute
+     */
+    public static function createFromArray(array $items)
+    {
+        $attribute = new self();
+
+        foreach ($items as $item) {
+            $attribute->add($item);
+        }
+
+        return $attribute;
+    }
+
+    /**
+     * @param string $item
+     * @return static
+     */
+    public function add(string $item)
+    {
+        $this->data = $this->data->push($item)->unique();
+
+        return $this;
+    }
+
+    /**
+     * @param MultivalueAttribute $attribute
+     * @return static
+     */
+    public function merge(MultivalueAttribute $attribute)
+    {
+        $this->data = $this->data
+            ->pushArray($attribute->data->toArray())
+            ->unique();
+
+        return $this;
+    }
+
+    /**
+     * @return string
+     */
+    public function first()
+    {
+        return $this->data->firstOrDefault('');
+    }
+
+    /**
+     * @return string[]
+     */
+    public function toArray()
+    {
+        return $this->data->toArray();
+    }
+}
diff --git a/src/Domain/Core/Person.php b/src/Domain/Core/Person.php
index 356756e..540df7b 100644
--- a/src/Domain/Core/Person.php
+++ b/src/Domain/Core/Person.php
@@ -30,6 +30,20 @@ class Person implements EntityInterface
         $this->setIdentity($identity);
     }
 
+    /**
+     * @param string $name
+     * @param \XaiCorp\AbcParser\Domain\Atoms\EmailAtom $email
+     * @param \Webpatser\Uuid\Uuid|null $identity
+     * @return static
+     * @throws \Enzyme\Axiom\Exceptions\AtomException
+     */
+    public static function create(string $name, EmailAtom $email, Uuid $identity = null)
+    {
+        $nameAtom = new StringAtom($name);
+
+        return new static($nameAtom, $email, $identity);
+    }
+
     /**
      * Checks whether this model has the given attribute set.
      *
diff --git a/src/Domain/Core/Tune.php b/src/Domain/Core/Tune.php
index cede3be..36cfc98 100644
--- a/src/Domain/Core/Tune.php
+++ b/src/Domain/Core/Tune.php
@@ -124,6 +124,7 @@ class Tune implements EntityInterface
     /**
      * @param string $title
      * @return $this
+     * @deprecated
      */
     public function addTitle(string $title) : Tune
     {
@@ -278,15 +279,19 @@ class Tune implements EntityInterface
                 call_user_func([$this, 'set'.$attribute], $value);
                 break;
 
+            case 'Authors':
+                call_user_func([$this, 'addAuthor'], $value);
+                break;
+
             default:
                 $this->append($attribute, $value);
         }
     }
 
-    protected function append($attribute, array $values)
+    protected function append($attribute, MultivalueAttribute $values)
     {
         $method = 'add' . substr($attribute, 0, -1);
-        foreach ($values as $value) {
+        foreach ($values->toArray() as $value) {
             call_user_func([$this, $method], $value);
         }
     }
@@ -329,13 +334,18 @@ class Tune implements EntityInterface
      * @param StringAtom $musicLine
      * @return $this
      */
-    public function appendMusicLine(string $musicLine)
+    public function addMusicLine(string $musicLine)
     {
-        $this->music .= $musicLine->getValue() . PHP_EOL;
+        $this->music .= $musicLine . PHP_EOL;
 
         return $this;
     }
 
+    public function getMusic()
+    {
+        return $this->music;
+    }
+
     public function merge(Tune $source)
     {
         //TODO
diff --git a/src/Domain/Core/TuneAttributeArrayBuilder.php b/src/Domain/Core/TuneAttributeArrayBuilder.php
new file mode 100644
index 0000000..4521afb
--- /dev/null
+++ b/src/Domain/Core/TuneAttributeArrayBuilder.php
@@ -0,0 +1,172 @@
+<?php
+namespace XaiCorp\AbcParser\Domain\Core;
+
+use Enzyme\Axiom\Atoms\StringAtom;
+use Webpatser\Uuid\Uuid;
+use XaiCorp\AbcParser\Domain\Atoms\EmailAtom;
+use XaiCorp\AbcParser\Domain\Atoms\UnsignedIntegerAtom;
+
+class TuneAttributeArrayBuilder implements TuneBuilder
+{
+    protected $attributes = [];
+
+    public static function create()
+    {
+        return new self();
+    }
+
+    public function getTune(Uuid $identity = null): \XaiCorp\AbcParser\Domain\Core\Tune
+    {
+        return new Tune($this->attributes, $identity);
+    }
+
+    /**
+     * @return $this
+     */
+    public function handleEndOfMusic()
+    {
+        // TODO: Implement handleEndOfMusic() method.
+    }
+
+    /**
+     * @param UnsignedIntegerAtom $param
+     * @return $this
+     */
+    public function setIndex(UnsignedIntegerAtom $param): \XaiCorp\AbcParser\Domain\Core\TuneBuilder
+    {
+        $this->attributes['index'] = $param;
+
+        return $this;
+    }
+
+    /**
+     * @param \Enzyme\Axiom\Atoms\StringAtom $param
+     * @return $this
+     */
+    public function appendMusic(StringAtom $param): \XaiCorp\AbcParser\Domain\Core\TuneBuilder
+    {
+        $index = 'MusicLines';
+        $item = $param->getValue();
+
+        if (!isset($this->attributes[$index])) {
+            $this->attributes[$index] = MultivalueAttribute::create($item);
+        } else {
+            $this->attributes[$index]->add($item);
+        }
+
+        return $this;
+    }
+
+    public function addTitle(string $title): \XaiCorp\AbcParser\Domain\Core\TuneBuilder
+    {
+        $index = 'Titles';
+        $item = $title;
+
+        if (!isset($this->attributes[$index])) {
+            $this->attributes[$index] = MultivalueAttribute::create($item);
+        } else {
+            $this->attributes[$index]->add($item);
+        }
+
+        return $this;
+    }
+
+    public function setKey(StringAtom $key)
+    {
+        // TODO: Implement setKey() method.
+    }
+
+    public function setMeter(StringAtom $key)
+    {
+        // TODO: Implement setMeter() method.
+    }
+
+    public function addAuthor(string $name): \XaiCorp\AbcParser\Domain\Core\TuneBuilder
+    {
+        $index = 'Authors';
+        $item = Author::create($name, new EmailAtom(''));
+
+        if (!isset($this->attributes[$index])) {
+            $this->attributes[$index] = $item;
+        } else {
+            $this->attributes[$index]->add($item);
+        }
+
+        return $this;
+    }
+
+    public function addComposer(StringAtom $composerName)
+    {
+        // TODO: Implement addComposer() method.
+    }
+
+    public function addTranscriber(StringAtom $transcriberName)
+    {
+        // TODO: Implement addTranscriber() method.
+    }
+
+    public function addDiscography(StringAtom $recording)
+    {
+        // TODO: Implement addDiscography() method.
+    }
+
+    public function addGroup(StringAtom $groupName)
+    {
+        // TODO: Implement addGroup() method.
+    }
+
+    public function setParts(StringAtom $part)
+    {
+        // TODO: Implement setParts() method.
+    }
+
+    public function addSource(StringAtom $source)
+    {
+        // TODO: Implement addSource() method.
+    }
+
+    public function addFilename(StringAtom $filename)
+    {
+        // TODO: Implement addFilename() method.
+    }
+
+    public function addHistory(StringAtom $history)
+    {
+        // TODO: Implement addHistory() method.
+    }
+
+    public function addRhythm(StringAtom $rhythm)
+    {
+        // TODO: Implement addRhythm() method.
+    }
+
+    public function addBook(StringAtom $param)
+    {
+        // TODO: Implement addBook() method.
+    }
+
+    public function addWords(StringAtom $param)
+    {
+        // TODO: Implement addWords() method.
+    }
+
+    public function addTempo(StringAtom $param)
+    {
+        // TODO: Implement addTempo() method.
+    }
+
+    public function addNoteLength(StringAtom $param)
+    {
+        // TODO: Implement addNoteLength() method.
+    }
+
+    public function addNote(StringAtom $param)
+    {
+        // TODO: Implement addNote() method.
+    }
+
+    public function addOrigin(StringAtom $param)
+    {
+        // TODO: Implement addOrigin() method.
+    }
+}
diff --git a/src/Domain/Core/TuneBuilder.php b/src/Domain/Core/TuneBuilder.php
new file mode 100644
index 0000000..880ca26
--- /dev/null
+++ b/src/Domain/Core/TuneBuilder.php
@@ -0,0 +1,69 @@
+<?php
+/**
+ * Created by PhpStorm.
+ * User: richard
+ * Date: 06/05/18
+ * Time: 8:16 AM
+ */
+
+namespace XaiCorp\AbcParser\Domain\Core;
+
+use Enzyme\Axiom\Atoms\StringAtom;
+use Webpatser\Uuid\Uuid;
+use XaiCorp\AbcParser\Domain\Atoms\UnsignedIntegerAtom;
+
+interface TuneBuilder
+{
+    public function getTune(Uuid $identity = null): \XaiCorp\AbcParser\Domain\Core\Tune;
+
+    /**
+     * @return $this
+     */
+    public function handleEndOfMusic();
+
+    /**
+     * @param UnsignedIntegerAtom $param
+     * @return $this
+     */
+    public function setIndex(UnsignedIntegerAtom $param): \XaiCorp\AbcParser\Domain\Core\TuneBuilder;
+
+    public function appendMusic(StringAtom $param): \XaiCorp\AbcParser\Domain\Core\TuneBuilder;
+
+    public function addTitle(string $title): \XaiCorp\AbcParser\Domain\Core\TuneBuilder;
+
+    public function setKey(StringAtom $key);
+
+    public function setMeter(StringAtom $key);
+
+    public function addAuthor(string $name): \XaiCorp\AbcParser\Domain\Core\TuneBuilder;
+
+    public function addComposer(StringAtom $composerName);
+
+    public function addTranscriber(StringAtom $transcriberName);
+
+    public function addDiscography(StringAtom $recording);
+
+    public function addGroup(StringAtom $groupName);
+
+    public function setParts(StringAtom $part);
+
+    public function addSource(StringAtom $source);
+
+    public function addFilename(StringAtom $filename);
+
+    public function addHistory(StringAtom $history);
+
+    public function addRhythm(StringAtom $rhythm);
+
+    public function addBook(StringAtom $param);
+
+    public function addWords(StringAtom $param);
+
+    public function addTempo(StringAtom $param);
+
+    public function addNoteLength(StringAtom $param);
+
+    public function addNote(StringAtom $param);
+
+    public function addOrigin(StringAtom $param);
+}
diff --git a/src/Domain/Modules/Interpreter/Builder.php b/src/Domain/Modules/Interpreter/Builder.php
index 1ef2dd1..c9f9312 100644
--- a/src/Domain/Modules/Interpreter/Builder.php
+++ b/src/Domain/Modules/Interpreter/Builder.php
@@ -2,6 +2,7 @@
 namespace XaiCorp\AbcParser\Domain\Modules\Interpreter;
 
 use Enzyme\Axiom\Atoms\StringAtom;
+use Webpatser\Uuid\Uuid;
 use XaiCorp\AbcParser\Domain\Atoms\EmailAtom;
 use XaiCorp\AbcParser\Domain\Atoms\UnsignedIntegerAtom;
 use XaiCorp\AbcParser\Domain\Core\Author;
@@ -9,10 +10,11 @@ use XaiCorp\AbcParser\Domain\Core\Composer;
 use XaiCorp\AbcParser\Domain\Core\Setting;
 use XaiCorp\AbcParser\Domain\Core\Transcriber;
 use XaiCorp\AbcParser\Domain\Core\Tune;
+use XaiCorp\AbcParser\Domain\Core\TuneBuilder;
 use XaiCorp\AbcParser\Domain\Core\TuneCollection;
-use XaiCorp\AbcParser\Models\Laravel5\TuneSetting;
+//use XaiCorp\AbcParser\Models\Laravel5\TuneSetting;
 
-class Builder
+class Builder implements TuneBuilder
 {
     /**
      * @var Tune
@@ -50,7 +52,7 @@ class Builder
         $this->tune->addSetting($this->setting);
     }
 
-    public function getTune()
+    public function getTune(Uuid $identity = null): \XaiCorp\AbcParser\Domain\Core\Tune
     {
         return $this->tune;
     }
@@ -64,7 +66,7 @@ class Builder
     }
 
     /**
-     * @return $this
+     * @return TuneBuilder
      */
     public function handleEndOfMusic()
     {
@@ -82,26 +84,26 @@ class Builder
     }
 
     /**
-     * @param UnsignedIntegerAtom $index
-     * @return $this
+     * @param UnsignedIntegerAtom $param
+     * @return TuneBuilder
      */
-    public function setIndex(UnsignedIntegerAtom $index)
+    public function setIndex(UnsignedIntegerAtom $param): \XaiCorp\AbcParser\Domain\Core\TuneBuilder
     {
-        $this->tune->setIndex($index);
+        $this->tune->setIndex($param);
 
         return $this;
     }
 
-    public function appendMusic(StringAtom $musicLine)
+    public function appendMusic(StringAtom $param): \XaiCorp\AbcParser\Domain\Core\TuneBuilder
     {
-        $this->setting->addMusicLine($musicLine->getValue());
+        $this->setting->addMusicLine($param->getValue());
 
         return $this;
     }
 
-    public function addTitle(StringAtom $title)
+    public function addTitle(string $title): \XaiCorp\AbcParser\Domain\Core\TuneBuilder
     {
-        $this->tune->addTitle($title->getValue());
+        $this->tune->addTitle($title);
 
         return $this;
     }
@@ -120,9 +122,9 @@ class Builder
         return $this;
     }
 
-    public function addAuthor(StringAtom $name)
+    public function addAuthor(string $name): \XaiCorp\AbcParser\Domain\Core\TuneBuilder
     {
-        $author = new Author($name, new EmailAtom(''));
+        $author = Author::create($name, new EmailAtom(''));
         $this->tune->addAuthor($author);
 
         return $this;
diff --git a/src/Domain/Modules/Interpreter/DefaultInterpreter.php b/src/Domain/Modules/Interpreter/DefaultInterpreter.php
index ce68082..9f28ff1 100644
--- a/src/Domain/Modules/Interpreter/DefaultInterpreter.php
+++ b/src/Domain/Modules/Interpreter/DefaultInterpreter.php
@@ -94,7 +94,6 @@ class DefaultInterpreter extends Interpreter
             $context->next();
         } while ($context->count() > $context->key());
 
-//        return $this->builder->getTune();
         return $this;
     }
 
diff --git a/src/Domain/Modules/Interpreter/Interpreter.php b/src/Domain/Modules/Interpreter/Interpreter.php
index a821126..c3ad62f 100644
--- a/src/Domain/Modules/Interpreter/Interpreter.php
+++ b/src/Domain/Modules/Interpreter/Interpreter.php
@@ -2,6 +2,7 @@
 namespace XaiCorp\AbcParser\Domain\Modules\Interpreter;
 
 use XaiCorp\AbcParser\Domain\Core\Tune;
+use XaiCorp\AbcParser\Domain\Core\TuneBuilder;
 use XaiCorp\AbcParser\Domain\Core\TuneCollection;
 
 abstract class Interpreter
@@ -11,14 +12,14 @@ abstract class Interpreter
     const LN_FIELD = '/^\w:(.+)$/';
 
     /**
-     * @var Builder
+     * @var TuneBuilder
      */
     protected $builder;
 
     /**
      * Interpreter constructor.
      */
-    public function __construct(Builder $builder)
+    public function __construct(TuneBuilder $builder)
     {
         $this->builder = $builder;
     }
diff --git a/src/Domain/Modules/Interpreter/Lexicon/Author.php b/src/Domain/Modules/Interpreter/Lexicon/Author.php
index 36f07be..49b6db5 100644
--- a/src/Domain/Modules/Interpreter/Lexicon/Author.php
+++ b/src/Domain/Modules/Interpreter/Lexicon/Author.php
@@ -3,6 +3,7 @@ namespace XaiCorp\AbcParser\Domain\Modules\Interpreter\Lexicon;
 
 use Enzyme\Axiom\Atoms\StringAtom;
 use XaiCorp\AbcParser\Domain\Atoms\UnsignedIntegerAtom;
+use XaiCorp\AbcParser\Domain\Core\TuneBuilder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Builder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Context;
 
@@ -11,11 +12,11 @@ class Author implements Lex
     use LineKeyDataTrait;
 
     /**
-     * @var Builder
+     * @var TuneBuilder
      */
     protected $builder;
 
-    public function __construct(Builder $builder)
+    public function __construct(TuneBuilder $builder)
     {
         $this->builder = $builder;
     }
@@ -32,7 +33,7 @@ class Author implements Lex
         list($key, $data) = $this->getKeyDataFromLine($line);
 
         if ($key === 'A') {
-            $this->builder->addAuthor(new StringAtom($data));
+            $this->builder->addAuthor($data);
         }
 
         return $next($context);
diff --git a/src/Domain/Modules/Interpreter/Lexicon/Book.php b/src/Domain/Modules/Interpreter/Lexicon/Book.php
index 17c4128..3dba5a7 100644
--- a/src/Domain/Modules/Interpreter/Lexicon/Book.php
+++ b/src/Domain/Modules/Interpreter/Lexicon/Book.php
@@ -3,6 +3,7 @@ namespace XaiCorp\AbcParser\Domain\Modules\Interpreter\Lexicon;
 
 use Enzyme\Axiom\Atoms\StringAtom;
 use XaiCorp\AbcParser\Domain\Atoms\UnsignedIntegerAtom;
+use XaiCorp\AbcParser\Domain\Core\TuneBuilder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Builder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Context;
 
@@ -11,11 +12,11 @@ class Book implements Lex
     use LineKeyDataTrait;
 
     /**
-     * @var Builder
+     * @var TuneBuilder
      */
     protected $builder;
 
-    public function __construct(Builder $builder)
+    public function __construct(TuneBuilder $builder)
     {
         $this->builder = $builder;
     }
diff --git a/src/Domain/Modules/Interpreter/Lexicon/Composer.php b/src/Domain/Modules/Interpreter/Lexicon/Composer.php
index 46a3100..ac70c91 100644
--- a/src/Domain/Modules/Interpreter/Lexicon/Composer.php
+++ b/src/Domain/Modules/Interpreter/Lexicon/Composer.php
@@ -3,6 +3,7 @@ namespace XaiCorp\AbcParser\Domain\Modules\Interpreter\Lexicon;
 
 use Enzyme\Axiom\Atoms\StringAtom;
 use XaiCorp\AbcParser\Domain\Atoms\UnsignedIntegerAtom;
+use XaiCorp\AbcParser\Domain\Core\TuneBuilder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Builder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Context;
 
@@ -11,11 +12,11 @@ class Composer implements Lex
     use LineKeyDataTrait;
 
     /**
-     * @var Builder
+     * @var TuneBuilder
      */
     protected $builder;
 
-    public function __construct(Builder $builder)
+    public function __construct(TuneBuilder $builder)
     {
         $this->builder = $builder;
     }
diff --git a/src/Domain/Modules/Interpreter/Lexicon/Discography.php b/src/Domain/Modules/Interpreter/Lexicon/Discography.php
index bd1655d..b9b4941 100644
--- a/src/Domain/Modules/Interpreter/Lexicon/Discography.php
+++ b/src/Domain/Modules/Interpreter/Lexicon/Discography.php
@@ -3,6 +3,7 @@ namespace XaiCorp\AbcParser\Domain\Modules\Interpreter\Lexicon;
 
 use Enzyme\Axiom\Atoms\StringAtom;
 use XaiCorp\AbcParser\Domain\Atoms\UnsignedIntegerAtom;
+use XaiCorp\AbcParser\Domain\Core\TuneBuilder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Builder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Context;
 
@@ -11,11 +12,11 @@ class Discography implements Lex
     use LineKeyDataTrait;
 
     /**
-     * @var Builder
+     * @var TuneBuilder
      */
     protected $builder;
 
-    public function __construct(Builder $builder)
+    public function __construct(TuneBuilder $builder)
     {
         $this->builder = $builder;
     }
diff --git a/src/Domain/Modules/Interpreter/Lexicon/EndOfTune.php b/src/Domain/Modules/Interpreter/Lexicon/EndOfTune.php
index 7c83550..7d93318 100644
--- a/src/Domain/Modules/Interpreter/Lexicon/EndOfTune.php
+++ b/src/Domain/Modules/Interpreter/Lexicon/EndOfTune.php
@@ -3,6 +3,7 @@ namespace XaiCorp\AbcParser\Domain\Modules\Interpreter\Lexicon;
 
 use Enzyme\Axiom\Atoms\StringAtom;
 use XaiCorp\AbcParser\Domain\Atoms\UnsignedIntegerAtom;
+use XaiCorp\AbcParser\Domain\Core\TuneBuilder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Builder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Context;
 
@@ -11,11 +12,11 @@ class EndOfTune implements Lex
     use LineKeyDataTrait;
 
     /**
-     * @var Builder
+     * @var TuneBuilder
      */
     protected $builder;
 
-    public function __construct(Builder $builder)
+    public function __construct(TuneBuilder $builder)
     {
         $this->builder = $builder;
     }
diff --git a/src/Domain/Modules/Interpreter/Lexicon/Filename.php b/src/Domain/Modules/Interpreter/Lexicon/Filename.php
index 77f0923..a7a2bef 100644
--- a/src/Domain/Modules/Interpreter/Lexicon/Filename.php
+++ b/src/Domain/Modules/Interpreter/Lexicon/Filename.php
@@ -3,6 +3,7 @@ namespace XaiCorp\AbcParser\Domain\Modules\Interpreter\Lexicon;
 
 use Enzyme\Axiom\Atoms\StringAtom;
 use XaiCorp\AbcParser\Domain\Atoms\UnsignedIntegerAtom;
+use XaiCorp\AbcParser\Domain\Core\TuneBuilder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Builder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Context;
 
@@ -11,11 +12,11 @@ class Filename implements Lex
     use LineKeyDataTrait;
 
     /**
-     * @var Builder
+     * @var TuneBuilder
      */
     protected $builder;
 
-    public function __construct(Builder $builder)
+    public function __construct(TuneBuilder $builder)
     {
         $this->builder = $builder;
     }
diff --git a/src/Domain/Modules/Interpreter/Lexicon/Group.php b/src/Domain/Modules/Interpreter/Lexicon/Group.php
index 73b3a2c..ed3f959 100644
--- a/src/Domain/Modules/Interpreter/Lexicon/Group.php
+++ b/src/Domain/Modules/Interpreter/Lexicon/Group.php
@@ -3,6 +3,7 @@ namespace XaiCorp\AbcParser\Domain\Modules\Interpreter\Lexicon;
 
 use Enzyme\Axiom\Atoms\StringAtom;
 use XaiCorp\AbcParser\Domain\Atoms\UnsignedIntegerAtom;
+use XaiCorp\AbcParser\Domain\Core\TuneBuilder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Builder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Context;
 
@@ -11,11 +12,11 @@ class Group implements Lex
     use LineKeyDataTrait;
 
     /**
-     * @var Builder
+     * @var TuneBuilder
      */
     protected $builder;
 
-    public function __construct(Builder $builder)
+    public function __construct(TuneBuilder $builder)
     {
         $this->builder = $builder;
     }
diff --git a/src/Domain/Modules/Interpreter/Lexicon/History.php b/src/Domain/Modules/Interpreter/Lexicon/History.php
index 2afe87d..2013ae1 100644
--- a/src/Domain/Modules/Interpreter/Lexicon/History.php
+++ b/src/Domain/Modules/Interpreter/Lexicon/History.php
@@ -3,6 +3,7 @@ namespace XaiCorp\AbcParser\Domain\Modules\Interpreter\Lexicon;
 
 use Enzyme\Axiom\Atoms\StringAtom;
 use XaiCorp\AbcParser\Domain\Atoms\UnsignedIntegerAtom;
+use XaiCorp\AbcParser\Domain\Core\TuneBuilder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Builder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Context;
 
@@ -11,11 +12,11 @@ class History implements Lex
     use LineKeyDataTrait;
 
     /**
-     * @var Builder
+     * @var TuneBuilder
      */
     protected $builder;
 
-    public function __construct(Builder $builder)
+    public function __construct(TuneBuilder $builder)
     {
         $this->builder = $builder;
     }
diff --git a/src/Domain/Modules/Interpreter/Lexicon/Index.php b/src/Domain/Modules/Interpreter/Lexicon/Index.php
index cdca636..984e435 100644
--- a/src/Domain/Modules/Interpreter/Lexicon/Index.php
+++ b/src/Domain/Modules/Interpreter/Lexicon/Index.php
@@ -3,6 +3,7 @@ namespace XaiCorp\AbcParser\Domain\Modules\Interpreter\Lexicon;
 
 use Enzyme\Axiom\Atoms\StringAtom;
 use XaiCorp\AbcParser\Domain\Atoms\UnsignedIntegerAtom;
+use XaiCorp\AbcParser\Domain\Core\TuneBuilder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Builder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Context;
 
@@ -11,11 +12,11 @@ class Index implements Lex
     use LineKeyDataTrait;
 
     /**
-     * @var Builder
+     * @var TuneBuilder
      */
     protected $builder;
 
-    public function __construct(Builder $builder)
+    public function __construct(TuneBuilder $builder)
     {
         $this->builder = $builder;
     }
diff --git a/src/Domain/Modules/Interpreter/Lexicon/KeySignature.php b/src/Domain/Modules/Interpreter/Lexicon/KeySignature.php
index 2171b10..37a74d5 100644
--- a/src/Domain/Modules/Interpreter/Lexicon/KeySignature.php
+++ b/src/Domain/Modules/Interpreter/Lexicon/KeySignature.php
@@ -3,6 +3,7 @@ namespace XaiCorp\AbcParser\Domain\Modules\Interpreter\Lexicon;
 
 use Enzyme\Axiom\Atoms\StringAtom;
 use XaiCorp\AbcParser\Domain\Atoms\UnsignedIntegerAtom;
+use XaiCorp\AbcParser\Domain\Core\TuneBuilder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Builder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Context;
 
@@ -11,11 +12,11 @@ class KeySignature implements Lex
     use LineKeyDataTrait;
 
     /**
-     * @var Builder
+     * @var TuneBuilder
      */
     protected $builder;
 
-    public function __construct(Builder $builder)
+    public function __construct(TuneBuilder $builder)
     {
         $this->builder = $builder;
     }
diff --git a/src/Domain/Modules/Interpreter/Lexicon/Meter.php b/src/Domain/Modules/Interpreter/Lexicon/Meter.php
index 378bb29..973fbdc 100644
--- a/src/Domain/Modules/Interpreter/Lexicon/Meter.php
+++ b/src/Domain/Modules/Interpreter/Lexicon/Meter.php
@@ -3,6 +3,7 @@ namespace XaiCorp\AbcParser\Domain\Modules\Interpreter\Lexicon;
 
 use Enzyme\Axiom\Atoms\StringAtom;
 use XaiCorp\AbcParser\Domain\Atoms\UnsignedIntegerAtom;
+use XaiCorp\AbcParser\Domain\Core\TuneBuilder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Builder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Context;
 
@@ -11,11 +12,11 @@ class Meter implements Lex
     use LineKeyDataTrait;
 
     /**
-     * @var Builder
+     * @var TuneBuilder
      */
     protected $builder;
 
-    public function __construct(Builder $builder)
+    public function __construct(TuneBuilder $builder)
     {
         $this->builder = $builder;
     }
diff --git a/src/Domain/Modules/Interpreter/Lexicon/MusicLine.php b/src/Domain/Modules/Interpreter/Lexicon/MusicLine.php
index 413f3a4..4df61dc 100644
--- a/src/Domain/Modules/Interpreter/Lexicon/MusicLine.php
+++ b/src/Domain/Modules/Interpreter/Lexicon/MusicLine.php
@@ -3,6 +3,7 @@ namespace XaiCorp\AbcParser\Domain\Modules\Interpreter\Lexicon;
 
 use Enzyme\Axiom\Atoms\StringAtom;
 use XaiCorp\AbcParser\Domain\Atoms\UnsignedIntegerAtom;
+use XaiCorp\AbcParser\Domain\Core\TuneBuilder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Builder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Context;
 
@@ -11,11 +12,11 @@ class MusicLine implements Lex
     use LineKeyDataTrait;
 
     /**
-     * @var Builder
+     * @var TuneBuilder
      */
     protected $builder;
 
-    public function __construct(Builder $builder)
+    public function __construct(TuneBuilder $builder)
     {
         $this->builder = $builder;
     }
diff --git a/src/Domain/Modules/Interpreter/Lexicon/NoteLength.php b/src/Domain/Modules/Interpreter/Lexicon/NoteLength.php
index 9ef7315..b2dd722 100644
--- a/src/Domain/Modules/Interpreter/Lexicon/NoteLength.php
+++ b/src/Domain/Modules/Interpreter/Lexicon/NoteLength.php
@@ -3,6 +3,7 @@ namespace XaiCorp\AbcParser\Domain\Modules\Interpreter\Lexicon;
 
 use Enzyme\Axiom\Atoms\StringAtom;
 use XaiCorp\AbcParser\Domain\Atoms\UnsignedIntegerAtom;
+use XaiCorp\AbcParser\Domain\Core\TuneBuilder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Builder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Context;
 
@@ -11,11 +12,11 @@ class NoteLength implements Lex
     use LineKeyDataTrait;
 
     /**
-     * @var Builder
+     * @var TuneBuilder
      */
     protected $builder;
 
-    public function __construct(Builder $builder)
+    public function __construct(TuneBuilder $builder)
     {
         $this->builder = $builder;
     }
diff --git a/src/Domain/Modules/Interpreter/Lexicon/Notes.php b/src/Domain/Modules/Interpreter/Lexicon/Notes.php
index 001b9e6..274280d 100644
--- a/src/Domain/Modules/Interpreter/Lexicon/Notes.php
+++ b/src/Domain/Modules/Interpreter/Lexicon/Notes.php
@@ -3,6 +3,7 @@ namespace XaiCorp\AbcParser\Domain\Modules\Interpreter\Lexicon;
 
 use Enzyme\Axiom\Atoms\StringAtom;
 use XaiCorp\AbcParser\Domain\Atoms\UnsignedIntegerAtom;
+use XaiCorp\AbcParser\Domain\Core\TuneBuilder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Builder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Context;
 
@@ -11,11 +12,11 @@ class Notes implements Lex
     use LineKeyDataTrait;
 
     /**
-     * @var Builder
+     * @var TuneBuilder
      */
     protected $builder;
 
-    public function __construct(Builder $builder)
+    public function __construct(TuneBuilder $builder)
     {
         $this->builder = $builder;
     }
diff --git a/src/Domain/Modules/Interpreter/Lexicon/Origin.php b/src/Domain/Modules/Interpreter/Lexicon/Origin.php
index 02cb4eb..88b85e6 100644
--- a/src/Domain/Modules/Interpreter/Lexicon/Origin.php
+++ b/src/Domain/Modules/Interpreter/Lexicon/Origin.php
@@ -3,6 +3,7 @@ namespace XaiCorp\AbcParser\Domain\Modules\Interpreter\Lexicon;
 
 use Enzyme\Axiom\Atoms\StringAtom;
 use XaiCorp\AbcParser\Domain\Atoms\UnsignedIntegerAtom;
+use XaiCorp\AbcParser\Domain\Core\TuneBuilder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Builder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Context;
 
@@ -11,11 +12,11 @@ class Origin implements Lex
     use LineKeyDataTrait;
 
     /**
-     * @var Builder
+     * @var TuneBuilder
      */
     protected $builder;
 
-    public function __construct(Builder $builder)
+    public function __construct(TuneBuilder $builder)
     {
         $this->builder = $builder;
     }
diff --git a/src/Domain/Modules/Interpreter/Lexicon/Parts.php b/src/Domain/Modules/Interpreter/Lexicon/Parts.php
index 6194715..839b125 100644
--- a/src/Domain/Modules/Interpreter/Lexicon/Parts.php
+++ b/src/Domain/Modules/Interpreter/Lexicon/Parts.php
@@ -3,6 +3,7 @@ namespace XaiCorp\AbcParser\Domain\Modules\Interpreter\Lexicon;
 
 use Enzyme\Axiom\Atoms\StringAtom;
 use XaiCorp\AbcParser\Domain\Atoms\UnsignedIntegerAtom;
+use XaiCorp\AbcParser\Domain\Core\TuneBuilder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Builder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Context;
 
@@ -11,11 +12,11 @@ class Parts implements Lex
     use LineKeyDataTrait;
 
     /**
-     * @var Builder
+     * @var TuneBuilder
      */
     protected $builder;
 
-    public function __construct(Builder $builder)
+    public function __construct(TuneBuilder $builder)
     {
         $this->builder = $builder;
     }
diff --git a/src/Domain/Modules/Interpreter/Lexicon/Rhythm.php b/src/Domain/Modules/Interpreter/Lexicon/Rhythm.php
index 3c93c44..fe8004a 100644
--- a/src/Domain/Modules/Interpreter/Lexicon/Rhythm.php
+++ b/src/Domain/Modules/Interpreter/Lexicon/Rhythm.php
@@ -3,6 +3,7 @@ namespace XaiCorp\AbcParser\Domain\Modules\Interpreter\Lexicon;
 
 use Enzyme\Axiom\Atoms\StringAtom;
 use XaiCorp\AbcParser\Domain\Atoms\UnsignedIntegerAtom;
+use XaiCorp\AbcParser\Domain\Core\TuneBuilder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Builder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Context;
 
@@ -11,11 +12,11 @@ class Rhythm implements Lex
     use LineKeyDataTrait;
 
     /**
-     * @var Builder
+     * @var TuneBuilder
      */
     protected $builder;
 
-    public function __construct(Builder $builder)
+    public function __construct(TuneBuilder $builder)
     {
         $this->builder = $builder;
     }
diff --git a/src/Domain/Modules/Interpreter/Lexicon/Source.php b/src/Domain/Modules/Interpreter/Lexicon/Source.php
index c448953..3cfe1d4 100644
--- a/src/Domain/Modules/Interpreter/Lexicon/Source.php
+++ b/src/Domain/Modules/Interpreter/Lexicon/Source.php
@@ -3,6 +3,7 @@ namespace XaiCorp\AbcParser\Domain\Modules\Interpreter\Lexicon;
 
 use Enzyme\Axiom\Atoms\StringAtom;
 use XaiCorp\AbcParser\Domain\Atoms\UnsignedIntegerAtom;
+use XaiCorp\AbcParser\Domain\Core\TuneBuilder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Builder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Context;
 
@@ -11,11 +12,11 @@ class Source implements Lex
     use LineKeyDataTrait;
 
     /**
-     * @var Builder
+     * @var TuneBuilder
      */
     protected $builder;
 
-    public function __construct(Builder $builder)
+    public function __construct(TuneBuilder $builder)
     {
         $this->builder = $builder;
     }
diff --git a/src/Domain/Modules/Interpreter/Lexicon/Tempo.php b/src/Domain/Modules/Interpreter/Lexicon/Tempo.php
index 4650d5f..eda7ee0 100644
--- a/src/Domain/Modules/Interpreter/Lexicon/Tempo.php
+++ b/src/Domain/Modules/Interpreter/Lexicon/Tempo.php
@@ -3,6 +3,7 @@ namespace XaiCorp\AbcParser\Domain\Modules\Interpreter\Lexicon;
 
 use Enzyme\Axiom\Atoms\StringAtom;
 use XaiCorp\AbcParser\Domain\Atoms\UnsignedIntegerAtom;
+use XaiCorp\AbcParser\Domain\Core\TuneBuilder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Builder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Context;
 
@@ -11,11 +12,11 @@ class Tempo implements Lex
     use LineKeyDataTrait;
 
     /**
-     * @var Builder
+     * @var TuneBuilder
      */
     protected $builder;
 
-    public function __construct(Builder $builder)
+    public function __construct(TuneBuilder $builder)
     {
         $this->builder = $builder;
     }
diff --git a/src/Domain/Modules/Interpreter/Lexicon/Title.php b/src/Domain/Modules/Interpreter/Lexicon/Title.php
index 147effc..ead49ef 100644
--- a/src/Domain/Modules/Interpreter/Lexicon/Title.php
+++ b/src/Domain/Modules/Interpreter/Lexicon/Title.php
@@ -3,6 +3,7 @@ namespace XaiCorp\AbcParser\Domain\Modules\Interpreter\Lexicon;
 
 use Enzyme\Axiom\Atoms\StringAtom;
 use XaiCorp\AbcParser\Domain\Atoms\UnsignedIntegerAtom;
+use XaiCorp\AbcParser\Domain\Core\TuneBuilder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Builder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Context;
 
@@ -11,11 +12,11 @@ class Title implements Lex
     use LineKeyDataTrait;
 
     /**
-     * @var Builder
+     * @var TuneBuilder
      */
     protected $builder;
 
-    public function __construct(Builder $builder)
+    public function __construct(TuneBuilder $builder)
     {
         $this->builder = $builder;
     }
@@ -32,7 +33,7 @@ class Title implements Lex
         list($key, $data) = $this->getKeyDataFromLine($line);
 
         if ($key === 'T') {
-            $this->builder->addTitle(new StringAtom($data));
+            $this->builder->addTitle($data);
         }
 
         return $next($context);
diff --git a/src/Domain/Modules/Interpreter/Lexicon/Transcriber.php b/src/Domain/Modules/Interpreter/Lexicon/Transcriber.php
index 8427eb7..28cef88 100644
--- a/src/Domain/Modules/Interpreter/Lexicon/Transcriber.php
+++ b/src/Domain/Modules/Interpreter/Lexicon/Transcriber.php
@@ -3,6 +3,7 @@ namespace XaiCorp\AbcParser\Domain\Modules\Interpreter\Lexicon;
 
 use Enzyme\Axiom\Atoms\StringAtom;
 use XaiCorp\AbcParser\Domain\Atoms\UnsignedIntegerAtom;
+use XaiCorp\AbcParser\Domain\Core\TuneBuilder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Builder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Context;
 
@@ -11,11 +12,11 @@ class Transcriber implements Lex
     use LineKeyDataTrait;
 
     /**
-     * @var Builder
+     * @var TuneBuilder
      */
     protected $builder;
 
-    public function __construct(Builder $builder)
+    public function __construct(TuneBuilder $builder)
     {
         $this->builder = $builder;
     }
diff --git a/src/Domain/Modules/Interpreter/Lexicon/Words.php b/src/Domain/Modules/Interpreter/Lexicon/Words.php
index 8900e24..9d53f65 100644
--- a/src/Domain/Modules/Interpreter/Lexicon/Words.php
+++ b/src/Domain/Modules/Interpreter/Lexicon/Words.php
@@ -3,6 +3,7 @@ namespace XaiCorp\AbcParser\Domain\Modules\Interpreter\Lexicon;
 
 use Enzyme\Axiom\Atoms\StringAtom;
 use XaiCorp\AbcParser\Domain\Atoms\UnsignedIntegerAtom;
+use XaiCorp\AbcParser\Domain\Core\TuneBuilder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Builder;
 use XaiCorp\AbcParser\Domain\Modules\Interpreter\Context;
 
@@ -11,11 +12,11 @@ class Words implements Lex
     use LineKeyDataTrait;
 
     /**
-     * @var Builder
+     * @var TuneBuilder
      */
     protected $builder;
 
-    public function __construct(Builder $builder)
+    public function __construct(TuneBuilder $builder)
     {
         $this->builder = $builder;
     }
diff --git a/tests/unit/AbcParser/Domain/Core/TuneAttributeArrayBuilderTest.php b/tests/unit/AbcParser/Domain/Core/TuneAttributeArrayBuilderTest.php
new file mode 100644
index 0000000..e4739c3
--- /dev/null
+++ b/tests/unit/AbcParser/Domain/Core/TuneAttributeArrayBuilderTest.php
@@ -0,0 +1,37 @@
+<?php
+/**
+ * Created by PhpStorm.
+ * User: richard
+ * Date: 06/05/18
+ * Time: 8:28 AM
+ */
+
+use XaiCorp\AbcParser\Domain\Core\TuneAttributeArrayBuilder;
+use XaiCorp\AbcParser\Domain\Atoms\UnsignedIntegerAtom;
+use XaiCorp\AbcParser\Domain\Core\Tune;
+
+class TuneAttributeArrayBuilderTest extends \Codeception\Test\Unit
+{
+
+    public function testSetIndex()
+    {
+        $index = new UnsignedIntegerAtom('14');
+        $builder = new TuneAttributeArrayBuilder();
+
+        $tune = $builder->setIndex($index)->getTune();
+
+        $this->assertInstanceOf(Tune::class, $tune);
+        $this->assertEquals($index->getValue(), $tune->getIndex());
+    }
+
+    public function testAppendMusic()
+    {
+        $music = new \Enzyme\Axiom\Atoms\StringAtom('Abcd|');
+        $builder = new TuneAttributeArrayBuilder();
+
+        $tune = $builder->appendMusic($music)->getTune();
+
+        $this->assertInstanceOf(Tune::class, $tune);
+        $this->assertEquals($music->getValue(), trim($tune->getMusic()));
+    }
+}
diff --git a/tests/unit/AbcParser/Domain/Core/TuneTest.php b/tests/unit/AbcParser/Domain/Core/TuneTest.php
index 3925f9c..0389fcc 100644
--- a/tests/unit/AbcParser/Domain/Core/TuneTest.php
+++ b/tests/unit/AbcParser/Domain/Core/TuneTest.php
@@ -16,6 +16,7 @@ use XaiCorp\AbcParser\Domain\Core\Author;
 use XaiCorp\AbcParser\Domain\Core\Composer;
 use XaiCorp\AbcParser\Domain\Core\Tune;
 use XaiCorp\AbcParser\Domain\Core\Setting;
+use XaiCorp\AbcParser\Domain\Core\TuneAttributeArrayBuilder;
 
 class TuneTest extends \PHPUnit_Framework_TestCase
 {
@@ -28,17 +29,15 @@ class TuneTest extends \PHPUnit_Framework_TestCase
         $this->assertInstanceOf(Tune::class, $tune);
     }
 
-    public function testCanIntializeFromArray()
+    public function testCanInitializeFromArray()
     {
         $titles = ['Title'];
         $authors = ['Richard Morgan'];
 
-        $config = [
-            'Titles' => $titles,
-            'Authors' => $authors
-        ];
-
-        $tune = new Tune($config);
+        $tune = TuneAttributeArrayBuilder::create()
+            ->addTitle($titles[0])
+            ->addAuthor($authors[0])
+            ->getTune();
 
         $this->assertInstanceOf(Tune::class, $tune);
         $this->assertEquals($tune->getTitles(), $titles);
@@ -187,17 +186,21 @@ class TuneTest extends \PHPUnit_Framework_TestCase
 
     public function testMergeAddsExtraDataToTune()
     {
-        $targetTune = new Tune([
-            'titles' => ['target']
-        ]);
-        $sourceTune = new Tune([
-            'titles' => ['source']
-        ]);
+        $targetTune = TuneAttributeArrayBuilder::create()
+            ->addTitle('target')
+            ->getTune();
+
+        $sourceTune = TuneAttributeArrayBuilder::create()
+            ->addTitle('source')
+            ->getTune();
+
+        $expected = TuneAttributeArrayBuilder::create()
+            ->addTitle('target')
+            ->addTitle('source')
+            ->getTune($targetTune->identity());
 
         $result = $targetTune->merge($sourceTune);
 
-        $this->assertEquals(new Tune([
-            'titles' => ['target', 'source']
-        ]), $result);
+        $this->assertEquals($expected, $result);
     }
 }