A progressive doom metal act from Ajaccio on the island of Corsica, Mazzeri draws from local mythology — the Mazzeri being Corsican dream-hunters who predict death. Active since 2020, the band channels the island's unique cultural traditions into haunting, crushing doom.

Maärdh is a raw black metal and noise project from Novosibirsk, Russia. Their 2016 album 'Abomination Rage' delivers five tracks of harsh, unpolished extremity across roughly twelve minutes, blending abrasive noise elements with raw black metal's lo-fi production aesthetic.

Maïeutiste is a band from Saint-Étienne, France, formed in 2015, having evolved from black and doom metal into progressive black metal. Their creative arc reflects a deepening exploration of black metal's atmospheric and compositional possibilities.

Maāra are a black/doom metal band from Innsbruck, Tyrol, Austria, operating in the dark and atmospheric end of the black metal spectrum. The band maintains a Bandcamp presence under maara.bandcamp.com, representing the small but active black metal underground of the Tyrolean Alps. Specific release information remains limited, reflecting their underground status within the Austrian scene.

MCB is a project from Magdeburg, Germany, active since 2006, whose sound evolved from heavy/speed metal roots into industrial territory. This stylistic shift reflects an experimental spirit uncommon in the Saxony-Anhalt underground.

McDeath is an old-school thrash metal band from Dortmund, Germany, formed in 1998 and self-described as "Pure True Thrash." Veterans of Wacken 2007 and sharing stages with Sodom and Kreator, their discography from "Dreadful Paradise" (2003) through "Lord Of The Thrash" (2015) represents the Ruhrpott's unwavering commitment to classic thrash.

McGalligog is a melodic death and thrash metal band from Dublin, Ireland, formed in 2010. They blend melodic death metal with thrash from the Irish underground.

Burial Hordes is an Athens-based act that evolved from raw black metal in their early years to a devastating black/death hybrid. The band's transition reflects the broader trajectory of Greek extreme metal toward increasingly savage and uncompromising sounds.

A Belgian instrumental post-black metal project whose name is the Roman numeral for 1978, MCMLXXVIII describe their music as "wordless hymns to decay" and "raw, atmospheric aural sonic landscapes carved from shadows." Their albums The Sacred Rot and Wordless Hymns to Decay establish a bleak, minimalist aesthetic that forgoes vocals entirely in favor of texture and atmosphere.