Soul Terror is a Maryland band formed in 2013 that melds death metal, doom, and sludge into a slow-grinding, punishing sound. Their genre crossover places crushing heaviness at the center, drawing from both the morbidity of death metal and the oppressive weight of sludge and doom.

Soulgrind is a heavy metal band from Mesa, Arizona, active since 2010. They draw from traditional heavy metal's melodic and riff-driven foundations within Arizona's broad hard rock and metal community.

Soulmass is a Florida death-doom band formed in 2013, weaving the morbid atmosphere of doom metal into a death metal framework. Their sound pulls from the slow, crushing traditions of both genres, reflecting Florida's deep history in extreme music.

Soulpreacher is a sludge and doom metal band from Raleigh, North Carolina, active since 2000. One of the longer-running acts in the Southeast's heavy underground, they deliver lumbering, blues-infused heaviness characteristic of Southern sludge.

Sour Milk Theorem is a death/doom metal band from Hollywood, Maryland, formed in 2008, blending the funereal weight of doom metal with death metal's guttural heaviness for a sound steeped in slow-motion dread.

Sourvein is a veteran sludge/doom metal band from Wilmington, North Carolina, whose catalog of oppressive, swamp-soaked heaviness has made them a long-standing fixture of the Southern sludge underground since the early 2000s.

Sowbelly is a sludge/doom metal band from Durand, Michigan, active since 2009. They deal in slow, heavy riffs and oppressive atmosphere rooted firmly in the American sludge tradition.

Soyuz is a US stoner/doom metal band formed in 2020, named after the Soviet-era spacecraft and exploring the heavy, hypnotic riff territory where fuzzed-out stoner rock meets the weight of doom.

Space Coke is a stoner/doom metal band from Columbia, South Carolina, formed in 2015, delivering fuzz-laden, slow-burning riffs that sit at the intersection of heavy psychedelia and crushing doom.

Space God Ritual is a doom metal band from Portland, Oregon, formed in 2013. They craft slow, ceremonial doom with a cosmic dimension, emphasizing atmosphere and hypnotic repetition over speed.

Space Lord is a sludge/stoner/doom metal trio from Kenilworth, New Jersey, formed in 2017, stacking massive fuzzed-out riffs across the heavy spectrum from swampy sludge to slow, weed-charred doom.

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.

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.

Sparrowmilk is a doom and sludge metal band from Cleveland, Ohio, formed in 2017, trafficking in the city's tradition of slow, oppressive heaviness with droning riffs and suffocating atmosphere.