One of the things that I both love and hate about games like Guitar Hero and Rock Band is the large portion of songs that are from artists or genres that I don't listen to or don't care to listen to. When I just want to beat the game straight through, I don't want to bother with the unknown. However, the exposure to new (to me) artists has enlightened me to several songs that I otherwise would never have heard. One of the biggest unknowns that I now listen to on a regular basis is DragonForce.
I can only imagine how awesome it would be to be able to play the guitar like that.
If you'd like to see how fun the Guitar Hero version is, here you go:
And, for a little humor (and to show you that some people have WAAAAAAYYYY too much time on their hands), here is a Mario Paint rendition: