Various, Extreme, Vital Signs, Glen Burtnick, Tora Tora, Shark Island, Big Pig, Shark Island, Bricklin, Robbi Robb, Power Tool

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.