Just a heads up in case anyone else thinks that the game has locked up after buying new DLC from the Blitz in game store... It hasn't. It just seems like it has because if you have a large song library it background re-loads all your songs without anyway of telling you it's progress. So.... You can sit there for a couple of minutes without being able to do anything but if you wait long enough it will finally "free up"
Just a "the more you know" teaching moment from my personal experience.