It's on the itunes store now for 4.99. Harmonix has been making music related games for years now. including: Frequency Amplitude Karoke revolution Guitar hero 1 and 2 the upcoming "rock band" This game is a terrific purchase IMO. It comes with 7 tracks from various bands(all of them have at least one member working for harmonix(which is a good thing trust me)). You hit notes as they come down a center track using the skip back center and skip forward buttons. Then tehre are sweeps of smaller blue dots which travel over the columns. you complete these by sweeping your thumb over the click wheel in sync with those. You can also use any track in your collection(the game makes new note charts for each track).