Machine Head is an American heavy metal band from Oakland, California. The band was formed in 1991 by vocalist/guitarist Robb Flynn and bassist Adam Duce. The band's aggressive musicianship made them one of the pioneering bands in the new wave of American heavy metal. Machine Head's current lineup comprises Flynn and bassist Jared MacEachern. Duce, guitarists Logan Mader, Ahrue Luster and Phil Demmel and drummers Tony Costanza, Chris Kontos and Dave McClain are former members of the band; Mader and Kontos are currently touring with the band as part of the 25th anniversary tour for its first album.