Various, Bon Jovi, Whitesnake, Poison, Def Leppard, Iron Maiden, Guns N' Roses, Alice Cooper, Bon Jovi, Guns N' Roses

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.