Rock Band 2
Harmonix's "Rock Band 2" allows gamers to play together in a band setting as they take control of guitar/bass, drum and microphone video game peripherals, much like the "Guitar Hero: World Tour" and "Guitar Hero 5" video games. "Rock Band 2" can be played on the Xbox 360, PlayStation 2 and 3 and the Nintendo Wii.
Xbox 360
Luckily all the Guitar Hero guitar/bass, drum and microphone peripherals from "Guitar Hero 2" up to "Guitar Hero 5" are compatible with "Rock Band 2" on the Xbox 360.
PlayStation 2
The Guitar Hero guitar/bass and microphone peripherals work for the PlayStation 2's "Rock Band 2," but the drums do not.
PlayStation 3
The PlayStation 3 allows almost complete compatibility with the Guitar Hero peripherals and "Rock Band 2," except for the "Guitar Hero 2's" X-Plorer guitar.
Nintendo Wii
The Nintendo Wii, like the PlayStation 3, also almost allows complete compatibility except for the "Guitar Hero 2" X-Plorer guitar.
Compatibility Chart
For a complete list of what instrument peripherals work for which Guitar Hero or Rock Band video game, check out the compatibility chart found at http://www.rockband.com/compatibility.