Spacecorpse is a technical death metal and deathcore band from Boulder, Colorado, formed in 2020. They combine the precision and complexity of technical death metal with the structural aggression of deathcore, representing the heavier end of Colorado's growing extreme metal scene.

Spaced are a Buffalo hardcore band whose self-described far-out hardcore brings color, groove, and psychedelic personality into a style often defined by blunt force. Emerging from western New York's active hardcore environment, the band built a reputation through energetic shows and releases that make aggression feel elastic rather than one-dimensional. Their music combines fast hardcore rhythms, shouted vocals, bouncing bass, sharp guitar parts, and flashes of alternative rock melody, creating songs that can be heavy, playful, and defiant at once. Releases such as Spaced Jams, Spaced, and No Escape show a group interested in empowerment and movement, with vocalist Lexi Reyngoudt giving the songs a commanding center. The band often writes about pressure, selfhood, resistance, and refusing the pull of pessimism, but the music avoids gloom by keeping its pulse lively and direct. Spaced stand out because they understand that hardcore can be serious without being monochrome. Their visual style and sonic brightness make the band feel distinct, yet the foundation is still pit-ready urgency. Spaced matter as part of a newer hardcore wave that treats personality as strength, bringing weirdness, bounce, and conviction into short songs that hit quickly.

SpaceMetal is a stoner metal band from New Orleans, Louisiana, formed in 2015. Emerging from a city with one of America's richest heavy music traditions, they channel the amplified, riff-driven weight of stoner metal with the slow, humid groove endemic to the Crescent City's underground.

Spacetrucker is a grunge-inflected stoner metal band from St. Louis, Missouri, formed in 2016. They blend the fuzz and heavy low-end of stoner metal with the loose, blue-collar swagger of grunge, fitting well within the Midwest's tradition of unpretentious heavy rock.

Spaisekult is a Vermont-based progressive sludge metal and hardcore band formed in 2022. They meld the caustic, slow-burning density of sludge metal with hardcore's propulsive urgency and progressive metal's structural ambition, operating on the experimental edge of all three genres.

Spanghew is a sludge metal band from Seattle, Washington, formed in 2025. A newly emerged outfit in one of the country's most storied heavy music cities, they carry on the Pacific Northwest tradition of punishing, low-and-slow sludge metal.

Spare Change is a crossover thrash band from Chicago, Illinois, formed in 2015. They operate squarely in the tradition where thrash metal collides with hardcore punk, delivering the fast, irreverent, and abrasive energy that has defined the crossover genre since the 1980s.

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.

Dallas, Texas outfit Sparrows began in 2011 with a foundation in melodic death metal and metalcore before evolving toward a heavier blackened death metal sound, reflecting the broader evolution of the Dallas extreme metal scene.