2 you will need 2
You can use up to any combination of Four (4) Instruments (Guitars, Drums, Mics). But you need at least one.
No. But it works much easier if you own the Guitar Hero World Tour band pack.
Yes, you need a guitar hero wireless control, or a guitar hero USB microphone, or guitar hero drumset. You cannot play with the wii remote alone.
Nothing. Guitar Hero controllers are not compatible with Rock Band 1. They won't be until Harmonix and Activision have an agreement, then make a patch for it. You need to buy a Rock Band / 2 controller to play it.
okay if you what to play with the drummer you need the rock band controllers and the drums
Yeah you can use the GH I-III controllers as guitar and bass controllers in rock band. Although you can not use the Guitar Hero 1-3 guitar controllers on the PS3 console. You will need to buy the Rock Band guitar controller.
Yes you can but you need the ps3 game , ps2 rock band game won't work but controllers will . Yes you can but you need the ps3 game , ps2 rock band game won't work but controllers will .
You need to have all 4 instruments for the band. You also need the USB connectors for the controllers
It depends which Guitar Hero you have. Any of the Guitar Hero games except for Guitar Hero 1, 2, Rock the 80s and 3 have a band mode which lets 2-4 people play at once. For a full band you need 2 Guitar Controllers (any compatible with your console), a microphone (i am not sure about other people but Singstar microphones don't work on mine) and a Drum Set controller. You don't need to have all of these to play band mode, just two (the 2 Guitar controllers would be separate for that comment).
you need 4 controllers for wii, but not for 360, or ps3.
up to 4