Following last week's sneak peak at Guitar Hero: World Tour, top rival Rock Band has revealed some details about its own sequel. Most notably, the game will allow all tracks users purchased for the first installment to be compatible with Rock Band 2 without having to repurchase songs. Rock Band 2 promises to also have "the biggest and most diverse soundtrack ever" comprised entirely of master recordings. In terms of instruments, there will be improved drum and guitar peripherals, but the previous game's instruments will still work. Rock Band 2 will debut exclusively on XBox 360 in September before moving to additional systems later in the year.