Various, Poison, Megadeth, Alias, Hurricane, Vixen, Stryper, Black Sabbath, Queensrÿche

Bay Area Thrash Metal

Riffs cut like machine tools, tempos past 200bpm, and a garage circuit that rewrote American metal.

West Midlands Metal

Downtuned riffs from a factory city — Sabbath to grindcore, four decades of Birmingham making music heavier.