Audioslave was an American rock supergroup formed in Glendale, California, in 2001. The four-piece band consisted of Soundgarden's singer and guitarist Chris Cornell with Rage Against the Machine members Tom Morello (lead guitar), Tim Commerford (bass/backing vocals), 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. This time, the band chose Out of Exiles mixer, Brendan O'Brien, as producer.