premise: Tool is a rock band that formed in 1990.
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 . 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 .