premise: Tool is not a band.
hypothesis: Tool is an American rock band from Los Angeles , California . Formed in 1990 , the group 's line-up includes drummer Danny Carey , guitarist Adam Jones , and vocalist Maynard James Keenan . Justin Chancellor has been the band 's bassist since 1995 , replacing their original bassist Paul D'Amour . The band 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 ) and the most recent album , 10,000 Days ( 2006 ) , gaining the band critical acclaim , and commercial success around the world .