Fresno, California's Mohler specialize in the punishing intersection of slam and brutal death metal, where percussive breakdowns and guttural vocals create an experience that's more physical punishment than musical listening. Active since 2019, they represent the Central Valley's contribution to the slam underground.

Baldwin Park, California's Moldering Vibration drag sludge metal's thick, distorted hostility through the blasting chaos of grindcore, arriving somewhere ugly and cathartic in the process. A young band formed in 2021, they bring a caustic edge to the Los Angeles area underground.

Los Angeles' Molocchio, formed in 2024, take their name from the Italian evil eye and bring a similarly malevolent edge to their raw black metal, emerging from the L.A. underground with an aesthetic rooted in curse and occult dread. A genuinely new entry in the city's active black metal scene.

Los Angeles crossover act Momentum have been tearing through the city's underground since 2006, blending hardcore's rabid urgency with thrash metal's precision into a lean, relentless assault.

Hailing from Torrance in the South Bay of Los Angeles, this Monarch have been playing thrash metal since 2014, delivering the riff-forward intensity and aggression the genre demands.

San Diego's Mongrel have been fusing the brutality of death metal with the confrontational directness of hardcore since 2010, playing aggressive, no-nonsense music that pulls no punches.

San Jose's Monolith play heavy and thrash metal forged in the Bay Area tradition since 1993, carrying on a lineage of technically sharp, aggressive metal from one of the genre's most historically significant regions.

Ventura, California's Monotremata have been crafting experimental industrial metal since 2006, incorporating dissonant textures and mechanical rhythms into music that sits at the uncomfortable edge between aggression and abstraction.

A goregrind act out of Los Angeles, Monster Creamer formed in 2025 and lean into the deliberately absurd, grotesque end of grindcore, delivering blastbeat-heavy noise with all the restraint the genre demands — which is none.