I'm trying to use the facebook subscriptions api to get real-time updates of changes to a user's 'music.listens' connection. It doesn't look like this is currently possible, but I'm wondering if anyone has had any luck with this.
From http://developers.facebook.com/docs/reference/api/realtime/:
Note that you can not subscribe to changes on all properties and connections of the User object. Connections to which you can subscribe include: feed, friends, activities, interests, music, books, movies, television, likes, checkins, location, events.
So, no 'music.listens' yet.