Various, No Artist, Scorpions, No Artist, No Artist, No Artist, No Artist, Alcatrazz, Odin, Led Zeppelin, No Artist, No Artist, Helix, Helix, AC/DC, AC/DC, AC/DC, No Artist, No Artist, Ratt, No Artist

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.