Tool is an American rock band from Los Angeles, California, formed in 1990. Since their inception, the band's line-up has included drummer Danny Carey, guitarist Adam Jones, and vocalist Maynard James Keenan. Since 1995, Justin Chancellor has been the band's bassist, replacing their original bassist Paul D'Amour. Tool has won three Grammy Awards, performed worldwide tours, and produced albums topping the charts in several countries.
Tool emerged with a heavy metal sound on their first studio album Undertow in 1993, and later became a dominant act in the alternative metal movement with the release of their second effort, Ænima, in 1996. Unifying musical experimentation, visual arts, and a message of personal evolution continued with Lateralus (2001) and the most recent album 10,000 Days (2006), gaining the band critical acclaim around the world.
Tool's incorporation of visual arts with relatively long, complex releases, generally identifies the band as a style-transcending act; part of progressive rock and art rock. The relationship between the band and the music industry is ambivalent, at times marked by censorship and the band members' insistence on privacy.