Implement Google play music "Auto Playlists"
As suggested by Lttlwing16: the only thing missing is a section from google play music called "Auto Playlists" from my library, but don't know if this is a gmusicapi issue, or upmpdcli (or maybe is not available at all from play music?). It includes playlists of "thumbs up", "free and purchased", and "last added". These are pretty important to a subscribers library.