Tool is an American rock band from Los Angeles, California, USA, formed in 1990. They emerged with a heavy metal sound on their first studio album, Undertow (1993), and later became a dominant act in the alternative metal movement, with the release of their second album, Ænima in 1996. Their efforts to unify musical experimentation, visual arts, and a message of personal evolution continued with Lateralus (2001), 10,000 Days (2006) and the most recent album, Fear Inoculum (2019).

Line-up:
Maynard James Keenan – vocals (1990–)
Adam Jones – guitar (1990–)
Danny Carey – drums, percussion (1990–)
Justin Chancellor – bass (1995–)

Former Members:
Paul D'Amour – bass (1990–1995)