diff --git a/development/objects_collection.py b/development/objects_collection.py
index c7526dc..642bb18 100644
--- a/development/objects_collection.py
+++ b/development/objects_collection.py
@@ -25,7 +25,7 @@ if __name__ == "__main__":
     album_1.merge(album_2)
 
     print()
-    print(album_1.artist_collection.data)
+    print(*(f"{a.title_string} ; {a.id}" for a in album_1.artist_collection.data), sep=" | ")
 
     print(id(album_1.artist_collection), id(album_2.artist_collection))
     print(id(album_1.song_collection[0].main_artist_collection), id(album_2.song_collection[0].main_artist_collection))
\ No newline at end of file
diff --git a/music_kraken/objects/collection.py b/music_kraken/objects/collection.py
index c13a294..6b59ac9 100644
--- a/music_kraken/objects/collection.py
+++ b/music_kraken/objects/collection.py
@@ -76,106 +76,10 @@ class Collection(Generic[T]):
 
         del self._id_to_index_values[obj_id]
 
-    def _contained_in_self(self, __object: T) -> bool:
-        if __object.id in self._contains_ids:
-            return True
-
-        for name, value in __object.indexing_values:
-            if value is None:
-                continue
-            if value == self._indexed_values[name]:
-                return True
-        return False
-
-    def _contained_in_sub(self, __object: T, break_at_first: bool = True) -> List[Collection]:
-        """
-        Gets the collection this object is found in, if it is found in any.
-
-        :param __object:
-        :param break_at_first:
-        :return:
-        """
-        results = []
-
-        if self._contained_in_self(__object):
-            return [self]
-
-        for collection in self.children:
-            results.extend(collection._contained_in_sub(__object, break_at_first=break_at_first))
-
-            if break_at_first:
-                return results
-
-        return results
-
-    def _get_root_collections(self) -> List[Collection]:
-        if not len(self.parents):
-            return [self]
-
-        root_collections = []
-        for upper_collection in self.parents:
-            root_collections.extend(upper_collection._get_root_collections())
-        return root_collections
-
     @property
-    def _is_root(self) -> bool:
+    def is_root(self) -> bool:
         return len(self.parents) <= 0
 
-    def _get_parents_of_multiple_contained_children(self, __object: T):
-        results = []
-        if len(self.children) < 2 or self._contained_in_self(__object):
-            return results
-
-        count = 0
-
-        for collection in self.children:
-            sub_results = collection._get_parents_of_multiple_contained_children(__object)
-
-            if len(sub_results) > 0:
-                count += 1
-                results.extend(sub_results)
-
-        if count >= 2:
-            results.append(self)
-
-        return results
-
-    def merge_into_self(self, __object: T, from_map: bool = False):
-        """
-        1. find existing objects
-        2. merge into existing object
-        3. remap existing object
-        """
-        if __object.id in self._contains_ids:
-            return
-
-        existing_object: T = None
-
-        for name, value in __object.indexing_values:
-            if value is None:
-                continue
-
-            if value == self._indexed_values[name]:
-                existing_object = self._indexed_to_objects[value]
-                if existing_object.id == __object.id:
-                    return None
-
-                break
-
-        if existing_object is None:
-            return None
-
-        existing_object.merge(__object)
-
-        # just a check if it really worked
-        if existing_object.id != __object.id:
-            raise ValueError("This should NEVER happen. Merging doesn't work.")
-
-        self._map_element(existing_object, from_map=from_map)
-
-    def contains(self, __object: T) -> bool:
-        return len(self._contained_in_sub(__object)) > 0
-
     def _find_object_in_self(self, __object: T) -> Optional[T]:
         for name, value in __object.indexing_values:
             if value == self._indexed_values[name]:
diff --git a/music_kraken/objects/song.py b/music_kraken/objects/song.py
index 93b39ba..2437112 100644
--- a/music_kraken/objects/song.py
+++ b/music_kraken/objects/song.py
@@ -93,7 +93,6 @@ class Song(Base):
         self.album_collection.append_object_to_attribute = {
             "song_collection": self,
         }
-
         self.main_artist_collection.contain_given_in_attribute = {
             "main_album_collection": self.album_collection
         }