I think you people would like this game.
Essentualy it's DDR for your fingers. Gameplay consists of going a long a track and hitting L1, R1 or R2 to hit notes on the track. The track is devided by instruments, every time you complete a segment it playes that intrument for a time. The point is basicly to build the song and enjoy.
That's probably not a very good explination...
Anyways, it's very fun, but hard to find in North America. But if you do, get it.
Official Site.Edit: Oh yeah... I knew I forgot something. The music! This one has a wide veritety of genras including heavy metal, techno, rap, trance, and even synth-pop.
It's actually the second game of it's sort by the same company (Harmonix). The first was FreQuency focused more on techno and the like.