Solipcyst is a brutal death metal band from Minneapolis, Minnesota, formed in 2023, channeling the hyper-aggressive, clinically precise aesthetic of the brutal death metal underground into the Twin Cities extreme music scene.

Solipsis is a melodic death metal band from Boston, Massachusetts, formed in 2018, drawing on Scandinavian melodic death metal influences while rooting their sound in the New England extreme music underground.

Solipsismo is a technical/melodic death metal project from Cuenca, Ecuador, initially active around 2009 before being revived by Daniel Ortega and Gabriel Cuesta, who released the band's debut full-length Sangre Antigua in 2017. The band went on to release three further recordings — the EPs Antología de maldiciones (2018), Festival de la resurrección (2019), and Confession of a Fellow Citizen (2020) — and primarily explores instrumental and anime-influenced themes.

Solipsist is a Cleveland, Ohio band formed in 2007 operating across death metal, thrash, groove metal, and metalcore, reflecting the diverse heavy music lineage of the Rust Belt underground scene.

Solipsist is a brutal death metal band from Livermore, California, formed in 2007, delivering the punishing technical heaviness of the brutal death metal subgenre from the Bay Area underground.

Solis Nigri is a black metal band from Seattle, Washington, formed in 2024, contributing to the Pacific Northwest's active black metal underground with a sound rooted in the genre's cold, misanthropic traditions.

Solitarian is a black metal project from Dallas, Texas, formed in 2019, contributing lone, atmospheric black metal to the Texas underground extreme music scene.

Solitary Key is a black metal project from Santa Barbara, California, formed in 2018, crafting introspective and atmospheric black metal from the central California coast.

Solitary Ruin is a Portland, Oregon death/doom metal band formed in 2024, merging the grinding heaviness of death metal with the slow, desolate crawl of doom metal in the Pacific Northwest underground.