Suffocating Psychedelic Doom / Sludge Metal from Austin.

Sunrot are a sludge/drone/doom metal band from northern New Jersey, formed in 2014, known for punishing walls of noise that combine the slow-motion heaviness of doom with the abrasive corrosiveness of drone and the filth-soaked aggression of sludge.

Suns of the Morning Star are a blackened sludge and progressive metal band from Boca Raton, Florida, formed in 2012, weaving dense sludge heaviness with post-metal ambience and black metal atmosphere into expansive, darkly textured compositions.

Superjoint — formerly Superjoint Ritual — are a New Orleans, Louisiana sludge metal and crossover thrash band that reformed in 2016, co-founded by Pantera and Down vocalist Philip Anselmo, combining the grinding aggression of crossover thrash with the thick, swampy heaviness of the New Orleans sludge tradition.

Supervoid is a Pittsburgh, Pennsylvania band formed in 2012, blending sludge and stoner metal with psychedelic textures to produce dense, slow-burning soundscapes that reflect the gritty character of the city's underground scene.

Surus is a post-metal and sludge metal band from Tulsa, Oklahoma, formed in 2023, crafting slow, crushing soundscapes that blend atmospheric texture with the heavy, feedback-laden weight of the sludge tradition.

Sutter Cane is a Philadelphia, Pennsylvania groove and thrash metal band formed in 2012, named after the fictional horror author in John Carpenter's film, blending punishing groove rhythms with thrash metal intensity.

Svoboda is a Minneapolis, Minnesota sludge metal band formed in 2012, whose name means "freedom" in several Slavic languages, playing slow, abrasive, and emotionally dense sludge rooted in the Midwest underground.

Swaath is a sludge metal band from Portland, Maine, formed in 2012, channeling the crushing weight and bleak atmosphere characteristic of the northeastern underground heavy music scene.