sentences:  The games attempt to mimic many features of playing a real guitar, including the use of fast-fingering hammer-ons and pull-offs and the use of the whammy bar to alter the pitch of notes.Most games support single player modes, typically a Career mode to play through all the songs in the game, and both competitive and cooperative multiplayer modes.With the introduction of "Guitar Hero World Tour" in 2008, the game includes support for a four-player band including vocals and drums.