+A `CommandError` is raised if the album does not expose a cover.
+
+You can also use `readpicture` command to fetch embedded picture:
+
+.. code-block:: python
+
+ >>> cli = musicpd.MPDClient()
+ >>> cli.connect()
+ >>> track = 'muse/Amon Tobin/2011-ISAM/01-Amon Tobin - Journeyman.mp3'
+ >>> rpict = cli.readpicture(track, 0)
+ >>> if not rpict:
+ >>> print('No embedded picture found', file=sys.stderr)
+ >>> sys.exit(1)
+ >>> size = int(rpict['size'])
+ >>> done = int(rpict['binary'])
+ >>> with open('/tmp/cover', 'wb') as cover:
+ >>> cover.write(rpict['data'])
+ >>> while size > done:
+ >>> rpict = cli.readpicture(track, done)
+ >>> done += int(rpict['binary'])
+ >>> print(f'writing {rpict["binary"]}, done {100*done/size:03.0f}%')
+ >>> cover.write(rpict['data'])
+ >>> cli.disconnect()
+