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.

Spazmic is a brutal death metal and goregrind band from El Paso, Texas, formed in 2008, operating at the extreme end of the underground with dense, abrasive recordings that blend the gore-splattered imagery and brutality of the genre's most uncompromising practitioners.

Spazztic Blurr is a Portland, Oregon crossover thrash and grindcore band active since 1988, making them one of the Pacific Northwest's longest-running extreme acts and a veteran of the era when hardcore punk and thrash metal first collided.

Speak of the Devil is a thrash and death metal band from Roanoke, Virginia, formed in 2012, merging the riff-forward aggression of thrash with death metal heaviness in the tradition of the East Coast underground.

Speaker Eater is an atmospheric sludge and doom metal band from Wausau, Wisconsin, formed in 2011, building massive, slow-burning compositions that blend post-hardcore dynamics with the crushing weight of sludge and the desolate sprawl of atmospheric doom.

Speaking in Tongues is a thrash metal band from Baltimore, Maryland, formed in 2018, channeling the raw, aggressive spirit of classic American thrash with the intensity and DIY ethos of Baltimore's storied underground metal scene.

Speaks in Tongues is a black metal and ambient project from Everett, Washington, formed in 2018, weaving atmospheric texture into raw black metal frameworks. Their approach draws on the dissonant, introspective side of the genre, blending harsh aggression with meditative sonic passages.

Spear is a death metal band from Mesa, Arizona, active since 2016, delivering straightforward, punishing death metal rooted in the genre's foundational aesthetics. Their work favors crushing riffs and direct brutality over stylistic embellishment.

Spear Siege is a Texas blackened death metal act formed in 2025, combining the aggression of death metal with the cold, blasting ferocity of black metal. A newly emerged project, they represent the current wave of extreme metal coming out of the Lone Star State.