Machine Head is an American heavy metal band from San Francisco, California. Formed in 1992, the group was founded by Robb Flynn and Adam Duce. There have been 4 member changes since their inception. The current lineup of the band comprises Flynn (vocals, guitar), Duce (bass), ex-Vio-Lence guitarist Phil Demmel (guitar), and Dave McClain (drums). Machine Head is one of the pioneering bands in the New Wave of American Heavy Metal.
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