If it has same buttons it should just be able to plug in
yes
yes
yes yes
Yes, it is possible to use Guitar Hero 1 Contoller on Guitar Hero 3, also on all of the Guitar Hero games.
yes
yes...and you can use singstar mics for it to
Yes, the original guitar works for all of the new releases (so far) including rock band. But, the world tour edition is much sleeker, with the joystick closer to where your hand should be, and a star power button.
Every single Guitar Hero game released for the playstation three, also Guitar Hero 1 & 2 for the playstation two will be compatible if played with a PlayStation 3 console.
yes, all of the guitar hero controllers are compatible within the same console. For example any guitar hero controller made for ps2 will work on any guitar hero game on ps2.
Yes...that's why its called Guitar Hero... no, that's not true, you can play with the controllers on gh 1-3. once the microphone comes out you can no longer play with the controller, because that is the mic controller. in most cases yes.
The guitar controllers (for PS2) will work, yes. But the drum/mic controllers, no.
Definitely. As long as you're using the same platform--each platform [Xbox, PlayStation, Wii...] has their own controller, but it doesn't change with the game. :)