I LOVE Guitar Hero!!
I have GHII for Xbox 360, it's a lot of fun
My favorite songs to play are "Sweet Child O' Mine" and "Carry On My Wayward Son"
The songs are actually not performed by the original artists, they are cover versions made by people hired by the game developers. But the covers are decent and do sound pretty similar to the original song. In GHII there are 2 songs which are by the original artists ("Dead" and "Possum Kingdom" IIRC?).