yes, if its for the same console.
Yes- all Guitar Hero guitars for a specific console are compatible with all other Guitar Hero games for the same console.
Yes, it does! All guitar hero guitars and games will be interchangeable to that system.
i believe so
no
Well, that depends on which game it is. Guitar Hero I and II can only use two guitars. Guitar Hero 3 can use two guitars, but Guitar Hero: World Tour can use a whole band set of two guitars, a microphone and a drum set. Though it is rumored you can use up to 3 guitars in Guitar Hero 5. Even still, the majority of these games limit it to two guitars.
It comes with 2 guitar hero guitars and the game.
Yes. Any of the "Rockband" or "Guitar Hero" guitars will work for "Guitar Hero".
Yes the guitar hero world tour (4) controller will work with guitar hero 3 on any system
Yes, they are.
3
Yes you can. And you can also use guitar hero guitars for rock band. Trust me. I've tried.
Yes. As long as the guitar is from the same console (Example : Xbox 360 guitar hero III guitars work only on Guitar hero world tour for the Xbox 360)