Yes, but you need a microphone or a drum set.
Yes
No
Rock Band is compatible with most game controllers, including the Guitar Hero: World Tour mic. and guitar. However, since the GH: WT drum set has cymbals, I don't believe that it will be compatible with Rock Band.
if your interments are for ps3 and the rock band your getting is for ps3 then yes.
no.
yes you can with either the rock band drumset or guitar hero set
Assuming that your Guitar Hero guitar is a PlayStation 2 version and not Xbox or Wii, then yes it is compatible with Rock Band for PS2.
yes guitar hero too as long as you have a drum set that is meant for ps2 or is able to be wired to the ps3 u can play any type of guitar hero or rock band gam that contains drums but not dj hero
yes
The special edition bundle of Rock Band 2 includes a mike, a set of drums and a guitar.
No, you have to buy them seprate Actually, they are compatible. I have the set from World Tour, and I am playing Rock band with them right now.