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.

Megadeth is an American heavy metal band from Los Angeles, California, formed in 1983. Founded by Dave Mustaine following his departure from Metallica, the band has since released twelve studio albums, six live albums, two EPs, twenty six singles, thirty-two music videos, and three compilations.As a pioneer of the American thrash metal movement, Megadeth rose to international fame in the 1980s, but experienced numerous line-up changes, due partly to the band’s notorious substance abuse problems. From 1983 to 2002, Mustaine and bassist Dave Ellefson were the only continuous members of the band. After finding sobriety and securing a stable line-up, Megadeth went on to release a string of platinum and gold albums, including the platinum-selling landmark Rust in Peace in 1990 and the Grammy nominated, multi-platinum Countdown to Extinction in 1992. Megadeth disbanded in 2002 after Mustaine suffered a severe nerve injury to his left arm. However, following extensive physical therapy, Mustaine reformed the band in 2004 and released The System Has Failed, followed by United Abominations in 2007; the albums debuted on the Billboard Top 200 chart at #18 and #8, respectively. Megadeth, along with their new lead guitarist Chris Broderick, released their twelfth studio album, titled Endgame, on September 15, 2009.