Papa Roach is a four-piece hard rock band from Vacaville, California.They broke into the mainstream with their triple-platinum major-label debut Infest (2000). The group’s success continued with later releases Lovehatetragedy (2002), Getting Away with Murder (2004) and The Paramour Sessions (2006). Their latest album, Metamorphosis, was released on March 24, 2009. Papa Roach has sold more than 10 million copies worldwide.

Guns N’ Roses is an American hard rock/heavy metal band that formed in Hollywood, Los Angeles, California in 1985. The band, led by frontman and co-founder Axl Rose, has gone through numerous line-up changes and controversies since its formation; the current lineup comprises vocalist Rose, guitarists Ron “Bumblefoot” Thal, DJ Ashba and Richard Fortus, bassist Tommy Stinson, drummer Frank Ferrer and keyboardists Dizzy Reed and Chris Pitman. The band has released six studio albums, three EPs and one live album during its career.

System of a Down (sometimes simply referred to as SOAD or System) is an Armenian-American rock band from Glendale, California, formed in 1994. System of a Down consists of Serj Tankian (lead vocals, keyboards and rhythm guitar), Daron Malakian (vocals and lead guitar), Shavo Odadjian (bass), John Dolmayan (drums).
The band has released five studio albums and have sold over 20 million records worldwide.They have been nominated for four Grammy Awards, of which they have won one in 2006 for Best Hard Rock Performance. The group went on indefinite hiatus August 13, 2006