clean: remove artist song model and using performance as pivot (#1155)

app/Models/BaseModel.php

@@ -44,18 +44,4 @@ abstract class BaseModel extends Model implements HasSubtitle, Nameable
             $this->setConnection(Config::get($connectionKey));
         }
     }
-
-    // Temporary fix for Laravel 13.
-    public function newCollection(array $models = [])
-    {
-        $collectionClass = static::$collectionClass;
-
-        $collection = new $collectionClass($models);
-
-        if (Model::isAutomaticallyEagerLoadingRelationships()) {
-            $collection->withRelationshipAutoloading();
-        }
-
-        return $collection;
-    }
 }