Removed missing import.
@@ -40,7 +40,7 @@ import weakref
import pyglet
from . import interface
from pyglet.debug import debug_print
-from pyglet.media.drivers.base import AbstractAudioDriver, AbstractAudioPlayer, BackgroundScheduler
+from pyglet.media.drivers.base import AbstractAudioDriver, AbstractAudioPlayer
from pyglet.media.events import MediaEvent
from pyglet.media.drivers.listener import AbstractListener
