yes
Yes any guitar is compatible with any game
The Guitar Hero III guitar is completely compatible with Guitar Hero: World Tour provided you're still using it with the Wii.
Yes it will
If it's for the same system, yes.
All guitar hero controllers are compatible with every guitar hero game
Yes
You can use them with Guitar Hero: Metallica, Guitar Hero Smash Hits, and guitar hero 4
no sorry
no, each game has a different song except for guitar hero smash hits
It is compatible with Guitar Hero: Aerosmith and Guitar Hero: World Tour. Yeah, they use the same exact controller. The Aerosmith one just has a different faceplate
Guitar Hero 1, Guitar Hero Rock the 80s, Guitar Hero 2, Guitar Hero 3, Guitar Hero World Tour, Guitar Hero Metallica, Guitar Hero Smash Hits, Guitar Hero 5, Guitar Hero Van Halen
No. But it works much easier if you own the Guitar Hero World Tour band pack.