I cant believe this but...3 Guitar games come out this year (one i will be buying drums for!)
As far as music games go theres 3 which i desperatly want in this order..
3.Guitar hero 2: 80's, Come on its the 80's 
2.Rock band, This game looks to be amazing if it has the right songs, Drum kit, guitar and Mic are available. (Getting drums seeing as though i already have Guitar hero 2 guitar.)
3...GUITAR HERO III, Enough said really. This game will be amazing, the track listing so far aint too bad either so thats always a good sign, plus it has multiplay. Anyone want a game just add me