San Jose's Sunami have become the undisputed champions of modern beatdown hardcore, delivering anvil-heavy riffs and earth-shaking breakdowns that have made their live shows some of the most physically intense experiences in the entire hardcore world. Their self-titled 2022 EP and Flatspot Records releases distill hardcore down to its most primal, pit-destroying essence, with vocalist Julian Corrales's ferocious delivery driving songs built for maximum crowd violence. Sunami's no-frills, caveman-riff approach has resonated far beyond the hardcore scene, earning them crossover appeal and massive festival bookings.

Sungrinder is a stoner metal and rock band from Orange County, California, formed in 2015, rooted in the Southern California tradition of sun-scorched fuzz riffs and hazy, groove-driven heavy rock.

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Suntorn are a brutal death metal and deathcore band from San Diego, California, formed in 2016, unleashing punishing down-tuned brutality that combines the hyper-technical slaughter of brutal death metal with the breakdowns and heaviness of deathcore.

Supernaut is a stoner metal band from Santa Cruz, California, whose name is a nod to the Black Sabbath classic, channeling sun-baked, riff-heavy grooves rooted in the California coastal underground scene since 2017.

Supersonic Dragon Wagon is a stoner metal band from San Diego, California, active since 2013 and combining fuzzed-out guitar work with the desert-influenced heaviness that thrives in Southern California's DIY underground.

Suppressed Intentions is a San Luis Obispo, California band formed in 2022, fusing metalcore aggression with groove and thrash metal to produce a hybrid sound rooted in the Central Coast's emerging heavy music scene.

Surfeiter is a Los Angeles depressive black metal and noise project formed in 2023, channeling desolate atmospheres and feedback-laden misery in a city better known for its sun but home to a thriving underground extreme metal scene.

Surrender is a heavy metal band from Pasadena, California, formed in 2011, rooted in the classic heavy metal sound of Southern California's historically fertile underground with a straightforward, riff-centered approach.