Musicians and producers from Los Angeles, California

Documented string gauges, brands, and tunings Saul 'Slash' Hudson uses with Guns N' Roses, Velvet Revolver, and his solo band. With citations.

Documented string gauges, brands, and tunings Stephen Carpenter uses with Deftones on his ESP LTD STEF signature series. With citations.

Documented string gauges, brands, and gear Zakk Wylde uses with Black Label Society, Ozzy Osbourne, and the Pantera reunion tour. Dunlop Zakk Wylde String Lab signature strings, Gibson Custom Shop and Wylde Audio Les Pauls, EMG 81/85 pickups. With citations.

Chris Lord-Alge has mixed Green Day's Nimrod, American Idiot, 21st Century Breakdown, and Saviors. Five-time Grammy winner. AllMusic credit list of 1100+ entries spanning rock, pop, and arena country.

Drew Fulk produces Motionless In White, Ice Nine Kills, Bad Omens, and earlier Lil Peep. Editorial gauge analysis for the rhythm-guitar lane his productions sit in.

Rob Cavallo signed Green Day to Reprise and produced Dookie, Insomniac, Nimrod, American Idiot, Bullet in a Bible, and Saviors. Three-time Grammy winner. Former Warner Bros Records chairman.