Guitar Hero III: Legends of Rock boss battles give fans a chance to compete against legendary guitarists such as Slash and Tom Morello. Players are required to deplete the boss' Rock Meter before the boss goes into their Death Drain solo, which always means 'lights-out.' After defeating a boss, players unlock that guitarist as a playable character and continue to the encore for the set list, which is a master recording of one of their respective bands' most well-known tracks. for instance, When Morello is defeated, the next performance is "Bulls on Parade," during which Morello performs on stage alongside the player.