Timothy Robert Commerford ( born February 26 , 1968 ) is an American musician , best known as the bassist and backing vocalist for the American rock band Rage Against the Machine ( 1991–2000 ; 2007–2011 ) , supergroups Audioslave ( 2001–2007 ; 2017 ) and Prophets of Rage ( 2016–present ) .
Rage Against the Machine is a funk metal band .