The game is based on Guitar Hero World Tour, with support for lead and bass guitar, drums, and vocals. The game has many of the same features from World Tour, including single-player and band Career modes, online competitive modes, and the ability to create and share songs through "GHTunes". In addition to the normal difficulty levels presented in Guitar Hero World Tour, Guitar Hero: Metallica provides an "Expert+" difficulty for drums that allows the use of a second bass drum pedal to match the drumming style of Metallica's Lars Ulrich. The game features 28 master recordings spanning Metallica's career and an additional 21 songs selected by members of Metallica. The band performed extensive motion capture for the game for their in-game avatars and performances. The game includes several extras including behind-the-scenes videos of the motion capture sessions, tour and concert videos of the band, and Pop-Up Video-like facts for many of the songs on the game disc.