Rock Band 2 builds upon its foundation as the first music game to introduce co-operative band gameplay, multiple instruments, a robust online multiplayer experience, an unrivaled offering of downloadable content and raises the bar by delivering an entirely new level of depth, connectivity, authenticity and features including: Backwards compatibility with Rock Band downloadable music content. All previously purchased tracks immediately load into your Rock Band 2 song list. No need to re-purchase or re-download. The biggest and most diverse soundtrack ever featuring some of rock's most prolific acts, comprised entirely of master recordings. Major new and dynamic online modes that connect the entire Rock Band community in more ways than ever before both locally and globally. More variety of instrument choices than ever before with new and improved drum and guitar peripherals, enhanced functionality and innovative new designs - all fully compatible with the original Rock Band instruments.