This is the 4th game in the Guitar Hero series from Activision. This game just came out in October 2007, and it is already a huge improvement on the others. In addition to the usual gameplay, there are tons of great new songs to play along with. I think some of them may even be the normal performers singing/playing along, instead of covers. There is a multiplayer mode, as usual, but this time they added a multiplayer career mode. This has different songs for the encore than in the single player career mode. Also, when in the single player career mode, there are face offs with musicians where you have to use attacks to make them fail. It is a really fun game and definitely worth the money if you enjoyed the other guitar hero games (or even if you haven't played them yet)!