Looks like a few extra confirmed tracks have been added to GH2, which is due in November. The current list of confirmed tracks includes:

Anthrax–“Madhouse” Black Sabbath–“War Pigs” Butthole Surfers–“Who Was in My Room Last Night?” Guns N’ Roses–“Sweet Child O’ Mine” KISS–“Strutter” Lynyrd Skynyrd–“Freebird” Motley Crüe–“Shout at the Devil” Primus–“John the Fisherman” (Original Recording) Reverend Horton Heat–“Psychobilly Freakout” Rush–“YYZ” Stone Temple Pilots–“Tripping on a Hole in a Paper Heart” Van Halen–“You Really Got Me”

Thanks to GameSpot for the info.