playables = json.loads(playables)
# Find first track with matching ID (always the first one listed?)
- track = next(filter(lambda t: t['id'] == int(track_id), playables['tracks']))
+ track = next(t for t in playables['tracks'] if t['id'] == int(track_id))
# Construct title from artist(s), track name, and mix name
title = ', '.join((a['name'] for a in track['artists'])) + ' - ' + track['name']