diff --git a/mopidy/backends/__init__.py b/mopidy/backends/__init__.py
index 63ecb72e..d3dc0bce 100644
--- a/mopidy/backends/__init__.py
+++ b/mopidy/backends/__init__.py
@@ -17,6 +17,9 @@ class BaseCurrentPlaylistController(object):
     def __init__(self, backend):
         self.backend = backend
 
+    def add(self, track, at_position=None):
+        raise NotImplementedError
+
 class BasePlaybackController(object):
     PAUSED = 'paused'
     PLAYING = 'playing'