To many adds. The complaints about other reviews saying that the app doesn't register touches, I haven't had this problem. It is insanely difficult (just like guitar hero used to be) to get the maximum possible score (which I like). I haven't even played for 1 hour and I'm being told pay to play. GTFO with this. Either charge up front or not at all. I don't mind waiting real hours to unlock songs or spending money to do so, but telling me I'm limited on play with my unlocked ones is BS.