Massive Killing is a melodic death metal band from Altenburg, Germany, active since 2006 with a hybrid sound that incorporates progressive elements and space rock textures. Their albums "SOMSOK" (2006) and the later "OKTAKEL" push melodic death metal into atmospheric and experimental territory.

Massive Retaliation is a death metal/grindcore band from Passau, Germany, active since 2015. Their sound combines death metal's crushing weight with grindcore's relentless velocity, forged in the southeastern Bavarian border town at the confluence of three rivers.

Massive Thunderfuck was a sludge/doom/death metal band from the Neuss/Düsseldorf area of Germany, active from 2013 until their demise. Their 2019 album "Serpent Worship" delivered walls of down-tuned guitars and demonic, weed-filled shouts of hell across a blend of sludge, doom, and black metal.

Mastabah is a brutal death/black metal band from Gdańsk, Poland, formed in 2015. They forge extreme metal at the fierce intersection of black and death metal.

A death metal act from the northeastern Polish city of Łomża, Mastectomia has been delivering brutal compositions since 2014. The band channels surgical imagery into precise, cutting death metal.

Mastectomy is a brutal death metal band from Poznań, Poland, formed in 2014. They unleash unrelenting brutal death metal fury.

Masterless is a thrash and death metal band from Surrey, England, formed in 2017. They forge aggressive extreme metal from the London commuter belt.

Mastic Scum are one of Austria's most internationally recognized extreme metal bands, a brutal death metal and grindcore outfit from Salzburg founded in 1992 by Harry Gandler, Man Gandler, and Linga Moser. Their sound is defined by machine-precise rhythms, dissonant riffing, and a vocal onslaught spanning guttural lows to harsh highs, and they have released six studio albums including 'ICON' on MDD Records in 2022. A seventh album is currently in production as of 2026.

Mastication of Brutality Uncontrolled is a technical slam/brutal death metal band from Aschaffenburg, Germany, formed in 2026. They unleash unrelenting brutal death metal fury.