Succumb is a death metal band from San Francisco, California, formed in 2017, known for their dissonant, chaotic approach and the distinctive shrieking vocals of frontwoman Cheri Musrasrik, whose 2017 debut drew comparisons to Mitochondrion and Portal.

Sudden Loss is an Oakland, California band formed in 2017 that operates in the overlap between crossover thrash, death metal, and hardcore, combining Bay Area aggression with a menacing death metal edge.

Sudden Strength is a Los Angeles thrash/hardcore band formed in 2021, drawing equally from the velocity and riffing of thrash metal and the raw intensity of hardcore punk in the tradition of the LA crossover scene.

Suffer is a Los Angeles band formed in 1993 that combines thrash and groove metal with hardcore influences, reflecting the hard-edged street energy of the Southern California metal underground across more than three decades of activity.

Suffer the Gestalt is a depressive black metal project from San Jose, California, formed in 2020, channeling introspective despair and psychological bleakness into the DSBM tradition of slow, anguished compositions.

Los Angeles funeral doom band formed in 2012, delivering the glacially slow tempos, cavernous low-end, and suffocating atmosphere that define the most desolate end of the doom spectrum.

San Diego death metal band formed in 2022, contributing to the active Southern California extreme metal underground with a straightforward approach to the genre.

Venice, California's Suicidal Tendencies, led by the irrepressible Mike Muir, are one of the most important bands in the history of crossover thrash, having bridged the gap between hardcore punk and thrash metal since their 1983 self-titled debut and its iconic anthem 'Institutionalized.' Their influence extends across punk, metal, and funk metal through the groundbreaking work of members like Robert Trujillo (now in Metallica) and guitarist Rocky George. Four decades in, Suicidal Tendencies remain a furious, unpredictable live force whose impact on heavy music's cross-pollination of genres cannot be overstated.

Formed in Riverside, California in 2002, Suicide Silence became one of the defining bands of the deathcore movement under the tenure of vocalist Mitch Lucker. Their 2007 Century Media debut The Cleansing brought the genre significant mainstream attention, followed by No Time to Bleed (2009) and The Black Crown (2011). Lucker died in November 2012 following a motorcycle accident; the band continued with new vocalist Hernan 'Eddie' Hermida and is frequently cited alongside Whitechapel, Thy Art is Murder, and Job for a Cowboy as one of deathcore's founding pillars.