Wow. Check this out. The DS version of Guitar Hero - Guitar Hero: On Tour - will come with a fret device that slots into DS's GBA cart port. The game will include a line-up of more than 20 licensed songs from bands as Nirvana, OK Go, and No Doubt. The multiplayer stuff sounds awesome: players can activate power-ups that'll send raving fans to an opponent's screen, who will then have to sign autographs on the touchscreen to get rid of them. Or out-of-control pyrotechnics will be set ablaze, and players will have to blow them out using the DS microphone.
There's a movie here. Guitar Hero: On Tour releases this summer.