You may only need one set of instruments to play all your favorite games on Playstation. Playstation has been working with Neversoft, Activision, Harmonix, and Konami to get some sort of basic compatibility between all of the game sets and in announcement on the Playstation blog, they say they’ve made it happen.
In the announcement Michael Shorrock the director of publisher relations at Playstation said “For the most part, this means that the titles with musical peripherals will work with the other’s software. A few specific examples include: Guitar Hero: World Tour’s guitars and drums will work with Rock Band 2 and Konami’s Rock Revolution software. And yes, you guessed it, Rock Band 2’s guitar and drum set will work with Guitar Hero: World Tour and with Rock Revolution. Conversely, Rock Revolution’s drum set will work with both Guitar Hero: World Tour and Rock Band 2. In addition, Guitar Hero: World Tour and Rock Band 2 will both support the SingStar microphones.”
Playstation is currently still working on compatibility for the Guitar Hero and Rock band titles that are already on the market.