Souls of Dissolution is a black/death metal band from Riverside, California, formed in 2013. They operate in the blackened death territory, combining the tremolo-driven darkness of black metal with death metal's brutal low-end aggression in the Inland Empire underground.

Sound Barrier is a heavy metal band from Los Angeles, California, active since 2017. They carry on the tradition of melodic, hard-driving American heavy metal rooted in the West Coast scene.

Sound Cancer is a power/thrash metal band from Oceanside, California, formed in 2005, fusing the melodic precision of power metal with the crunching aggression of thrash across two decades of activity.

Space Satan is a stoner/doom metal band from Monrovia, California, formed in 2016. Their sound combines the slow, crushing weight of doom with the hazy, riff-forward groove of stoner metal, owing a debt to the desert rock tradition of Southern California.

Space Wax are a San Diego, California band formed in 2014, straddling stoner, doom, and traditional heavy metal. Their sound leans into vintage-toned riffing and analogue warmth, drawing equally from classic heavy metal and the fuzzier end of the stoner/doom spectrum.

Spaceboots is a raw and depressive black metal project from Santa Rosa, California, formed in 2013. They work in the lo-fi, emotionally corrosive tradition of depressive black metal, pairing minimal production with bleak atmospheric intensity.

Spaceboy is a San Francisco band formed in 2017, navigating an eclectic intersection of progressive stoner, doom, and death metal. Their genre-blending approach reflects the Bay Area's history of genre-boundary-pushing heavy music, layering psychedelic texture over heavier structural ambitions.

Spawn Winters is a gothic and doom metal band from Los Angeles, California, formed in 2016, weaving mournful atmosphere and heavy, downtuned riffs into a sound that draws equally from the melancholic gothic metal tradition and the glacial weight of doom.

Spectra is a heavy metal band from Rubidoux, California, formed in 2016, working within the traditional heavy metal style with an emphasis on melodic songwriting and classic genre sensibilities. Their sound reflects the enduring influence of the NWOBHM and American power metal traditions.