Bah, Guitar Hero. I played it once and I really didn't understand what on earth has to be the fun in that game.
Maybe it's because it feels so damn awkward when you're used to the real thing ( wood > plastic :-) )
Nevertheless, 'twould be pretty cool if such a game would exist on the Amiga. And make it run on a standard A500 on just one floppy disk - that way you will attract a far larger number of people than when it only runs on high spec AGA machines.