I have Google Play Music installed on my SG3, and have my Gmail account listed as the account to use. When I open the app, there is no music listed, and when I go to Play Music online, the phone is not listed as an authorized device. I don't remember doing anything special to add my previous devices, except maybe accepting an authorization request. Any idea how I might be able to add my SG3 to Play Music? Now that Audiogalaxy is no longer online, Play Music is very important.