Rock Band 3 is a music video game, developed by Harmonix Music Systems. The game was initially published and distributed in October 2010 by MTV Games and Electronic Arts, respectively, with Mad Catz taking over both roles a year later. It is the third main game in the Rock Band series. As with the previous titles, Rock Band 3 allows players to simulate the playing of rock music and many other subgenres using special instrument controllers mimicking lead and bass guitar, drums, and vocals. Rock Band 3 expands upon previous games by including three-part vocal harmonies—previously used in The Beatles: Rock Band and Green Day: Rock Band—and support for a keyboard instrument, a MIDI-compatible 25-key unit.