Rock Band allows up to four players to simulate the performance of popular rock music songs by playing with controllers modeled after musical instruments. Players can play the lead guitar, bass guitar, and drums parts to songs with “instrument controllers”, as well as sing through a USB microphone. Players are scored on their ability to match scrolling musical “notes” while playing instruments, or by their ability to match the singer’s pitch on vocals. Players with the Xbox 360 and PlayStation 3 versions can interact with players on the same platform through both online and offline multiplayer capabilities. In addition to the 58 core songs included on the game disc, over 2,000 downloadable songs were released for the Xbox 360 and PlayStation 3 versions.