Sound Barrier is a Houston, Texas heavy/speed metal outfit formed in 2017, delivering aggressive riff-driven metal that blends classic heavy metal foundations with the harder-edged momentum of speed metal.

Soundgarden is the seminal Seattle, Washington band whose fusion of stoner-inflected heavy metal, grunge, and crushing riff craft helped define the Pacific Northwest sound of the late 1980s and 1990s, led by the powerful vocals of Chris Cornell.

Southgate is a Portland, Oregon progressive deathcore band formed in 2009, layering the technical complexity and dynamic ambition of progressive metal atop deathcore's crushing low-end rhythmic foundation.

Southview is a heavy metal band from Rochelle, Illinois, formed in 2015 that blends traditional heavy metal with Southern metal influences, delivering a riff-driven sound rooted in American metal's blue-collar heartland tradition.

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.

SpaceCore is a Cleveland, Ohio band formed in 2024, working in experimental and psychedelic heavy metal. A recently formed outfit, they bring an exploratory approach to the genre, applying unconventional structures and textures to a foundation of traditional heavy metal.

Spawn of Man is a heavy metal band from Lewiston, Maine, formed in 2007, rooted in the classic tradition of American heavy metal and representing the small but dedicated underground metal community of central Maine.

Spaz Attack is a heavy and power metal band from Boston, Massachusetts, formed in 2017, delivering the high-energy riff-driven approach of classic American heavy metal with the melodic sensibility of the power metal tradition.

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.

Spectral Damnation is a progressive heavy and power metal band from Kingston, New York, formed in 2018, blending the epic melodic ambition of power metal with progressive metal's structural complexity. Their music favors expansive arrangements, technical proficiency, and soaring vocal dynamics.

Spectral Outrider is a New York blackened heavy metal band formed in 2022, fusing the melodic drive and classic riffing of traditional heavy metal with the rawer, more aggressive tones of black metal. The combination evokes the spirit of bands that straddle the line between NWOBHM-influenced metal and occult black metal.

Spectral Spectrum is a Massachusetts black/heavy metal band formed in 2023, blending the raw, cold edge of black metal with melodic heavy metal songwriting. The project reflects a broader trend in the American underground of pairing traditional metal's hook-driven structures with black metal's atmospheric harshness.

Speedfreak is a Southern/heavy metal band from Chicago, Illinois, formed in 2022, blending the groove and swagger of Southern metal with classic heavy metal riffing in an unusually Northern context.

Speer is a thrash/heavy metal band from Casper, Wyoming, formed in 2014, one of very few metal acts emerging from Wyoming's isolated high plains, playing straightforward metal rooted in classic thrash and traditional heavy metal.

Spell Breaker is a traditional heavy metal band from El Paso, Texas, formed in 2025, playing classic-styled metal drawing on the NWOBHM and American heavy metal traditions from one of Texas's border cities.