Massacration began as a sketch on Brazilian MTV comedy show Hermes & Renato — a parody of heavy metal excess and broken-English posturing — but quickly became a genuine phenomenon in its own right. Their debut album Gates of Metal Fried Chicken of Death (2005), produced by Ratos de Porão frontman João Gordo under the pseudonym "Rick Rubinho" and featuring Sérgio Mallandro, sold over 40,000 copies; a third album, Metal Is My Life, arrived in 2024 after a 15-year gap.

Massacre em Alphaville are a crust and sludge metal band from São Paulo who have been grinding out politically and environmentally charged material since the early 2000s. Their 2009 mini-CD Vacilou na Quebrada, Dorme na Vala and the 2015 full-length Estilhaços de Ilusão showcase a raw, communal approach built around multiple vocalists and a thick, feedback-drenched sound rooted in the city's underground hardcore scene.

Massacred is an Argentine brutal death metal and grindcore project driven by guitarist/vocalist Christian Edwards and bassist Robert Myiasis, drawing heavy inspiration from Mortician and incorporating horror film samples and Resident Evil video game themes throughout their music. The band has been prolific across multiple releases, including the 2022 album "Human Extermination" and the 20-track "Mortal Annihilation", released in March 2025 to positive notice from No Clean Singing. Their songs typically clock in at one to two minutes, delivering non-stop blast beats and heavy riffing in the old-school brutal death metal tradition.

Massakre is a pioneering thrash and death metal band from Santiago, Chile, founded in 1985 by Yanko Tólic, who built the project out of earlier garage bands Sepulcro and Embrión. Influenced by Celtic Frost, Slayer, and Hellhammer, they were among the first speed and thrash metal acts in Chile and Latin America, releasing their debut album Massacre in 1989 and continuing through Psychotic Redemption (2001) and Crematorium (2005). The band is also noted for their early adoption of corpse paint in a thrash metal context, a practice later imitated widely across the scene.

Master Goat play brutal, no-frills death metal out of Campo Grande, trafficking in openly blasphemous imagery as reflected in track titles like Golgota, Cruci-Fiction, and Tormento Infernal. Their approach leans on churning riffs and guttural vocals, drawing from old-school death metal traditions while keeping their sound stripped to the bone.

Masterhead are a three-piece thrash metal outfit from the Fortaleza metropolitan area whose sound draws heavily from the Bay Area tradition, with Francisco "Mustaine" Alves handling both guitar and vocals alongside Denilson Andrade and John Nascimento. They built their catalog through the 2008 demo Enemy of Time and the 2017 EP Waiting Terror, later releasing the single Metal Warrior in 2021.

Mastermind Unlimited are a heavy metal band from Nova Iguaçu who debuted with the EP Will There Be Peace? in 2021, stepping into the deep tradition of heavy metal coming out of the Rio de Janeiro satellite cities. The project sits firmly in classic heavy metal territory, prioritizing melody and traditional song structures over extremity.

Masturbation with the Bible is a brutal death metal and goregrind band from Caracas, Venezuela, active since 2013. They released their debut full-length "Drowned in Holy Vaginal Fluids" in 2018 through Narcoleptica Productions, followed by the compilation track "Good Nuns Gone Dirty" and the 2025 album "Odium," recorded at Masacre Studio. Their material deals in blasphemous, anti-religious, and extreme gore imagery delivered through a relentlessly heavy slamming brutal death framework.

Masturbator is a death metal band from Franca originally active from 1987 through the mid-1990s, with a 2010 reformation bringing the band back to life. Their 1992 demo 'The Pornographic Terror' documents their early raw death metal approach, and the current lineup — built around vocalist Samuel Death Tormentor, guitarist Sidinei Slaughterman, and bassist Jason Dissector — carries forward the same uncompromising brutality.