Lego Rock Band is a music video game, part of the Rock Band series, that incorporates elements from Lego video games. It was developed by TT Fusion in cooperation with Harmonix, and published by Warner Bros. Interactive Entertainment. The game, as with other games in the Rock Band series, allows up to four players to use instrument controllers to play lead and bass guitar, drums, and vocals on a number of rock music songs. (wikipedia.org)