gmusicapi allows control of Google Music with Python.

from gmusicapi import Mobileclient

api = Mobileclient()
api.login('user@gmail.com', 'my-password', Mobileclient.FROM_MAC_ADDRESS)
# => True

library = api.get_all_songs()
sweet_track_ids = [track['id'] for track in library
                   if track['artist'] == 'The Cat Empire']

playlist_id = api.create_playlist('Rad muzak')
api.add_songs_to_playlist(playlist_id, sweet_track_ids)

gmusicapi is not supported nor endorsed by Google.

That said, it's actively maintained, and powers a bunch of cool projects:

• alternate clients, including one designed for the visually impaired, a command line client and FUSE filesystem
• library management tools for syncing tracks, syncing playlists, and migrating to a different account
• proxies for media players, such as gmusicproxy and gmusicprocurator, as well as plugins for Mopidy and Squeezebox.
• enhancements like autoplaylists

Everything you need is at http://unofficial-google-music-api.readthedocs.org.

If the documentation doesn't answer your questions, or you just want to get in touch, either drop by #gmusicapi on Freenode or shoot me an email.

• September 2015: Google switched to a new music uploading endpoint, breaking uploading for outdated versions of gmusicapi.
• June 2015: Full mobileclient and webclient functionality was restored.
• May 2015: Limited mobileclient functionality was restored.
• April 2015: Google deprecated clientlogin, breaking both the webclient and mobileclient.
• November 2013: I started working fulltime at Venmo, meaning this project is back to night and weekend development.

For fine-grained development updates, follow me on Twitter: @simonmweber.

Copyright 2015 Simon Weber. Licensed under the 3-clause BSD. See LICENSE.