You Dont. You can download the theme song off marketplace to be able to play halo's theme song on Guitar Hero 3
You can use any guitar hero guitar with any guitar hero.
You can use them with Guitar Hero: Metallica, Guitar Hero Smash Hits, and guitar hero 4
Yes you can, you can use every type of guitar for any Guitar Hero game.
No. You can only use it on the guitar hero games after guitar hero 3.
yes most guitar hero products work on other guitar hero games
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yea
you cannot use guitar hero 3 cheats for and of the other guitar hero games
You can use it the same way you would use it on Guitar Hero 3. But it has more lag than the Guitar Hero 2 controller.
yup
The game is compatible with any guitar
Yes U Can