Audioslave was an American rock supergroup formed in Glendale, California, in 2001. The four-piece band consisted of Soundgarden's lead singer and rhythm guitarist Chris Cornell with Rage Against the Machine members Tom Morello, Tim Commerford, and Brad Wilk (drums). Critics first described Audioslave as a combination of Soundgarden and Rage Against the Machine, but by the band's second album, Out of Exile, it was noted that they had established a separate identity. Their unique sound was created by blending 1970s hard rock and 1990s alternative rock, with musical influences that included 1960s funk, soul and R&B. As with Rage Against the Machine, the band prided themselves on the fact that all sounds on their albums were produced using only guitars, bass, drums, and vocals, with emphasis on Cornell's wide vocal range and Morello's unconventional guitar solos.

Soundgarden was an American rock band formed in Seattle, Washington, in 1984 by singer and drummer Chris Cornell, lead guitarist Kim Thayil, and bassist Hiro Yamamoto. Cornell switched to rhythm guitar in 1985, replaced on drums initially by Scott Sundquist, and later by Matt Cameron in 1986. Yamamoto left in 1989 and was replaced initially by Jason Everman and shortly thereafter by Ben Shepherd. The band dissolved in 1997 and reformed in 2010. Following Cornell's death in 2017 and a year of uncertainty regarding the band's future, Thayil declared in October 2018 that Soundgarden had disbanded once again, though they did reunite in January 2019 for a one-off concert in tribute to Cornell. Not counting the one-off concert, Cornell and Thayil were the only members to appear in every incarnation of the band.