Sounds from Hell is a death/thrash metal band from West Haven, Connecticut, formed in 2021, delivering punishing riffs and aggressive tempos in the crossover tradition between old-school death metal and thrash.

Sounds of Chaos Below is a Topeka, Kansas band formed in 2022 that combines blackened death metal ferocity with brutal death metal density, carving out a particularly savage corner of the extreme metal underground in the American heartland.

SoundsOfSolace is a black metal project from eastern Kentucky, formed in 2022, drawing on the atmospheric and misanthropic currents of the genre while rooted in the rural isolation of Appalachian America.

Soundstorm is a technical thrash metal band from Belleville, New Jersey, formed in 2016, applying rigorous technical precision to the high-velocity thrash template in the tradition of the East Coast scene.

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.

Sourblood is a thrash metal band from Columbus, Ohio, formed in 2021, trafficking in the hard-hitting, velocity-driven riff work that connects them to both the classic thrash canon and the contemporary underground revival.

Source of Mysteries is a metalcore band from Montevideo, Uruguay, originally formed in 2011 and reconstituted in late 2016. The five-piece lineup — featuring two guitarists, drums, bass, and vocals — has released two albums, Resiliencia and Trauma, available on Bandcamp.

Source of Pain is a Phoenix, Arizona crossover/thrash metal band formed in 2024, blending the hardcore aggression of crossover with straight-ahead thrash metal speed in the tradition of the genre's most frenetic practitioners.

Sources is a deathcore band from Sarasota, Florida, formed in 2014, combining the downtuned breakdowns and rhythmic brutality of deathcore with death metal extremity within the fertile Florida extreme metal ecosystem.