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.

Southern Tongues is an Ohio death metal and hardcore band formed in 2019, bringing the visceral collision of extreme metal and hardcore aggression that defined bands working the boundary between the two genres in the American underground.

Space Monkey is a metalcore outfit from Cleveland, Ohio, formed in 2018. They operate within the aggressive riff-driven sound of the Midwest metalcore scene, blending heavy breakdowns with melodic sensibility.

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.

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.

Spellchucker is a doom/sludge metal band from Cleveland, Ohio, formed in 2018, delivering slow, oppressively heavy music that fuses traditional doom's despair with sludge metal's abrasive, feedback-drenched textures.

Spike is a Cincinnati heavy metal band that has been active since 2016, playing straightforward, riff-driven metal with roots in classic American and NWOBHM-influenced traditions.

Spiral Staircase is a black metal outfit from Cleveland, Ohio, formed in 2022 under the name Spiral Staircase Coven, channeling raw misanthropic energy through orthodox black metal aesthetics.

Spiritus Mundi is a heavy and thrash metal band from Sylvania, Ohio, formed in 2011, taking its name from W.B. Yeats and channeling classic metal aggression with a riff-centric approach rooted in the traditions of both genres.