I hate how pissy people get when they're famous. Do you understand how many small town local musicians would gladly kill to even have a song put in a Guitar Hero game? It would be an honor if Activision came up to me and asked me if I wanted to have a song in it. If they asked me to be in the game as a playable character, I would probably pass out. These people complaining need to shut up and learn that so many people would gladly trade places with them. Or at least learn to read the contract.
Also, this is completely off topic but while the market was being overrun with crappy reskinned Guitar Hero games, DJ Hero came out and is great. Just saying if you're tired of Guitar Hero, DJ Hero is something new and a whole lot of fun.