Muerto en Vida is a hardcore/grindcore/crossover/thrash band from Jódar, Spain, formed by members of Cabeza de Caballo, Death Whisper my Name, and Infecto. Their self-titled release and 'El Pacto' deliver aggressive, genre-blending extremity from the Spanish underground.

Mufunta is a sludge, stoner, and groove metal act from Stoke-on-Trent, formed in 2025. The band brings heavy, riff-driven grooves to the Potteries with a sound that draws from the best of NOLA sludge and southern groove.

Mugaa is a sludge/stoner metal act from Kyiv, formed in 2025. The band delivers crushing, fuzz-heavy compositions from the Ukrainian capital.

Muilutus is a grindcore and sludge metal act from the Helsinki-Espoo metropolitan area, merging the speed of grindcore with the crushing weight of sludge since 2016. The band's Finnish name signals their commitment to local linguistic identity within extreme music.

Murder Hollow is a doom, death, and sludge metal band from Tampere, Finland, formed in 2014. They channel crushing extremity through a devastating fusion of doom, death, and sludge.

An atmospheric sludge and post-metal band from Aarschot, Flemish Brabant, Belgium, active from 2006 to 2015 and revived in 2020, signed to Funtime Records. Their catalog includes the seven-track 'Ebb & Flow' (2013), compared favorably to Cult of Luna for its intense narrative arc, and the recording 'Set the Woods on Fire / Catharsis' (2020), which incorporated guest vocal arrangements by Belgian composer Déhà.

MWWB is a psychedelic stoner, sludge, and doom metal act from Wrexham in North Wales, delivering expansive, mind-altering heaviness since 2021. The band layers psychedelic textures over crushing doom foundations, creating immersive sonic landscapes.

My Master the Sun is a stoner/sludge/doom metal act from Lisbon, active since 2014. The band channels solar worship into heavy, sun-baked compositions from the Portuguese capital.

Mylène Sardoom is a sludge and doom metal band from Montpellier, France, formed in 2025. Their playful name belies crushing sludge-doom from the Languedoc region.