A progressive metal outfit from the Philadelphia suburb of Broomall, Pennsylvania, Clockwork blended symphonic prog complexity with technical metal muscle, drawing comparisons to Yes and Dream Theater. Their lone album Surface Tension showcased lush keyboards, intricate rhythms, and soaring guitar melodies.

A Flint, Michigan act working across melodic death metal, thrash, and straight death metal, Clovis bring a midwest blue-collar grit to their extreme metal sound. Their approach draws on the long lineage of Michigan's underground metal heritage.

Seaside, California's Clownhouse blend death metal heaviness with thrash metal's velocity into a raw, aggressive attack. Their work fits naturally within the broader California tradition of uncompromising underground metal.

Denver's Clusterfux have been the Mile High City's crossover thrash standard-bearers since 1995, combining hardcore punk's aggression with thrash metal riffs into a relentless, politically charged attack. Active again since 2017 and signed to Beer City Records, their latest album Defy keeps the fury very much alive.

Oakland, California thrash and heavy metal band Cobweb pull from the Bay Area's legendary thrash tradition while keeping one foot in classic metal territory. Their music has the gritty, street-level intensity that Oakland's underground is known for.

Queens, New York groove and thrash metal band Code 6 bring the aggressive, street-hardened edge of New York City metal to tightly wound groove and thrash riffs. They reflect the borough's long history of tough, no-frills heavy music.

Burlington, Vermont thrash metal band Code Black represent the Green Mountain State's scrappy underground with direct, high-energy riffing and a no-compromise approach. Vermont's small but passionate metal scene has room for exactly this kind of pit-ready thrash.

Trenton, New Jersey death and thrash metal band Coffin deal in fast, aggressive riffs and the kind of no-frills brutality that New Jersey's long thrash tradition demands. They're a street-level act from one of the Northeast's most storied underground scenes.

Philadelphia, Pennsylvania's Coffin Dust are a ferocious crossover thrash and death metal band that blast through songs with the speed and aggression of both traditions in full force. Philly's fertile extreme metal scene has produced few acts as relentlessly energetic.

Detroit, Michigan's Coffin Feeder blend death metal, hardcore, and thrash into a vicious hybrid that carries the working-class aggression of Motor City metal. Their crossover-adjacent sound draws from Detroit's long history of heavy, confrontational music.

Minneapolis, Minnesota's Coffin Rites blend black, death, and thrash metal into a savage underground hybrid drawing from all three genres' most vicious impulses. They're a strong entry in the Twin Cities' consistently strong extreme metal scene.

Charleston, SC's Coffin Slide tear through crossover thrash with a hardcore bite, mixing pit-ready riffs and short, punishing songs that sit at the intersection of thrash aggression and punk velocity.

Minneapolis's Cognitive Dissonance ride a thrash and grindcore collision course — tightly wound songs explode with short-fuse aggression and a political edge that has defined their underground run.

Punishing Industrial / Groove Metal out of Texas.

Los Angeles thrash veterans Cold Blood bring old-school precision and aggression to their work, channeling the Bay Area tradition through SoCal intensity in riff-forward, no-frills thrash metal.