This is the source for a web app called The Set Listener. The app creates a Spotify playlist for your favorite artist's most recent show. The app uses the Setlist.fm API and the Spotify API.
The 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 Spotify tracks via the Spotify Web API, and saves them to the user's Spotify Playlist after authorizing the user.