No, but all 360 instruments will work on the PS2 with Guitar Hero: Aerosmith and newer (except for drum kits on GH:A of course).
No, a PlayStation 3 Rock Band 2 controller will not work with the Xbox 360.
yes
No
yes
There is no rock band for the xbox.
no Xbox 360 does not work on the PS3
The Xbox 360 game bundle for Rock Band Video game does
Yes, all rock band instruments work on every rock band game
Yes, it does.
No, the Rock Band Stratocaster will work with World Tour, Rock Band 2, Aerosmith, and Rock Band only. It will not work with Guitar Hero II or Guitar Hero III.
It does not work. If it did, they wouldn't sell them in different packages... the drum pedal does work though.
"Where can you buy Rock Band for the original XBox?"