The Martyrium is a black metal project from Ahlen, Germany, formed in 2021. They deliver atmospheric black metal from the Westphalian underground.

The Masquerade is a symphonic/progressive metal band from England, active since 2014. Their music combines orchestral arrangements and theatrical flair with the technical precision of progressive metal, creating elaborate and dramatic compositions.

The Massacre Cave is a progressive heavy/thrash/groove metal band from the Isle of Eigg in the Scottish Inner Hebrides, active since 2012. Perhaps the most remote metal band in Britain, they take their name from a dark chapter of island history and deliver ambitious metal from a community of fewer than 100 people.

The Meaning Under is a progressive metal band from Padua, Italy, formed in 2016. They explore complex compositions and dynamic arrangements within a progressive metal framework.

Graz-based thrash metal band formed in 2013, The Mechanix operate with a self-described "Thrash Metal at its best" ethos and released their debut EP "Attacked By Ross PT. 1" in 2014. The band functions as an independent act within the Styrian metal underground.

The Medea Project is a doom/gothic/sludge metal band from the east coast of England, active since 2017. Named after the tragic figure of Greek mythology, their music blends the weight of doom and sludge with the dark romanticism of gothic metal.

The Meffs are an Essex punk duo made up of Lily Hopkins and Lewis Copsey, and their sound is built for maximum impact with minimal personnel. Since forming in 2019, they have used guitar, drums, shared urgency, and sharp political writing to create frantic British punk that feels both stripped down and fully charged. Releases such as Broken Britain, Broken Brains, and What a Life pull from garage punk, classic protest punk, and contemporary social frustration, with songs like "Stand Up, Speak Out," "No," "Clowns," and "Wasted on Women" showing the band's directness. The Meffs fit punk scope without qualification: short songs, hard-hit drums, overdriven guitar, anti-establishment bite, and live energy that prizes speed over polish. Their two-piece format gives the music a lean quality, but it does not feel small. Hopkins' vocal attack and Copsey's forceful drumming fill the space with agitation and swing. The band's appeal is practical and immediate: say the thing clearly, hit the chorus hard, and leave scorch marks before anyone can tidy the message up.

The Mensis Ritual is a death metal/deathcore band from England, formed in 2019. Their name references the nightmarish ritual from the video game Bloodborne, and their music delivers similarly intense and brutal extremity.

The Mirage from Vigo in Galicia deliver heavy metal and hard rock with the shimmering, illusory quality their name suggests since 2014. Their Atlantic-facing Galician port provides a unique setting for compositions that balance melodic accessibility with metal power.