This is the source for a fork of the web app called The Set Listener. The original app creates a Spotify playlist for your favorite artist's most recent show. This fork will do the same, but for Google Play Music. The app uses the Setlist.fm API and the Spotify API.
The original app is online at The Set Listener
The Set Listener has a server component that manages the API interaction with setlist.fm because the setlist.fm API doesn't support cross-domain access.
The web app is a relatively simple app that solicits and artist name from the user, finds recents shows by that artist via setlist.fm, looks up the Google Play Music tracks and creates a playlist. This uses the gmusicapi python module and is not officially supported by Google in any way.