diff --git a/mopidy/backends/__init__.py b/mopidy/backends/__init__.py
index 7cbfce5f..3a4cfe4d 100644
--- a/mopidy/backends/__init__.py
+++ b/mopidy/backends/__init__.py
@@ -112,10 +112,29 @@ class BasePlaybackController(object):
         raise NotImplementedError
 
     def next(self):
-        raise NotImplementedError
+        playlist = self.backend.current_playlist.playlist
+
+        if not self.current_track:
+            self.play()
+        elif self.playlist_position + 1 >= len(playlist.tracks):
+            self.stop()
+        else:
+            next_track = playlist.tracks[self.playlist_position+1]
+            self.play(next_track)
 
     def previous(self):
-        raise NotImplementedError
+        playlist = self.backend.current_playlist.playlist
+
+        if not self.current_track:
+            self.play()
+        elif not playlist.tracks:
+            self.stop()
+        elif self.playlist_position - 1 > 0:
+            first_track = playlist.tracks[0]
+            self.play(first_track)
+        else:
+            previous_track = playlist.tracks[self.playlist_position-1]
+            self.play(previous_track)
 
     def pause(self):
         raise NotImplementedError
diff --git a/mopidy/backends/gstreamer.py b/mopidy/backends/gstreamer.py
index 22237222..9abdda2f 100644
--- a/mopidy/backends/gstreamer.py
+++ b/mopidy/backends/gstreamer.py
@@ -85,31 +85,6 @@ class GStreamerPlaybackController(BasePlaybackController):
         if self.state != self.PLAYING:
             self.bin.set_state(gst.STATE_PLAYING)
 
-    def next(self):
-        playlist = self.backend.current_playlist.playlist
-
-        if not self.current_track:
-            self.play()
-        elif self.playlist_position + 1 >= len(playlist.tracks):
-            self.stop()
-        else:
-            next_track = playlist.tracks[self.playlist_position+1]
-            self.play(next_track)
-
-    def previous(self):
-        playlist = self.backend.current_playlist.playlist
-
-        if not self.current_track:
-            self.play()
-        elif not playlist.tracks:
-            self.stop()
-        elif self.playlist_position - 1 > 0:
-            first_track = playlist.tracks[0]
-            self.play(first_track)
-        else:
-            previous_track = playlist.tracks[self.playlist_position-1]
-            self.play(previous_track)
-
     @property
     def volume(self):
         return int(self.bin.get_property('volume') * 100)