diff --git a/mopidy/backends/base/__init__.py b/mopidy/backends/base/__init__.py
index 096a433f..963d9eb4 100644
--- a/mopidy/backends/base/__init__.py
+++ b/mopidy/backends/base/__init__.py
@@ -1,12 +1,4 @@
-from copy import copy
 import logging
-import random
-import time
-
-from mopidy import settings
-from mopidy.frontends.mpd import translator
-from mopidy.models import Playlist
-from mopidy.utils import get_class
 
 from .current_playlist import CurrentPlaylistController
 from .library import LibraryController, BaseLibraryProvider
@@ -17,30 +9,6 @@ from .stored_playlists import (StoredPlaylistsController,
 logger = logging.getLogger('mopidy.backends.base')
 
 class Backend(object):
-    """
-    :param core_queue: a queue for sending messages to
-        :class:`mopidy.process.CoreProcess`
-    :type core_queue: :class:`multiprocessing.Queue`
-    :param output: the audio output
-    :type output: :class:`mopidy.outputs.gstreamer.GStreamerOutput` or similar
-    :param mixer_class: either a mixer class, or :class:`None` to use the mixer
-        defined in settings
-    :type mixer_class: a subclass of :class:`mopidy.mixers.BaseMixer` or
-        :class:`None`
-    """
-
-    def __init__(self, core_queue=None, output=None, mixer_class=None):
-        self.core_queue = core_queue
-        self.output = output
-        if mixer_class is None:
-            mixer_class = get_class(settings.MIXER)
-        self.mixer = mixer_class(self)
-
-    #: A :class:`multiprocessing.Queue` which can be used by e.g. library
-    #: callbacks executing in other threads to send messages to the core
-    #: thread, so that action may be taken in the correct thread.
-    core_queue = None
-
     #: The current playlist controller. An instance of
     #: :class:`mopidy.backends.base.CurrentPlaylistController`.
     current_playlist = None
@@ -62,24 +30,3 @@ class Backend(object):
 
     #: List of URI prefixes this backend can handle.
     uri_handlers = []
-
-    def destroy(self):
-        """
-        Call destroy on all sub-components in backend so that they can cleanup
-        after themselves.
-        """
-
-        if self.current_playlist:
-            self.current_playlist.destroy()
-
-        if self.library:
-            self.library.destroy()
-
-        if self.mixer:
-            self.mixer.destroy()
-
-        if self.playback:
-            self.playback.destroy()
-
-        if self.stored_playlists:
-            self.stored_playlists.destroy()