Rock Band 2 is an interactive music game by Harmonix. It is a sequel to the game "Rock Band". To play the game, players use a microphone to sing or a controller to hit notes on the screen. Players get points by hitting the right notes at the right time. Earning points can help a player earn stars, which show how well a player performed the song. If a player misses too many notes or hits too many of the wrong notes, they fail out of the song. It has a quickplay mode and a world tour mode.