Macacos da Manchúria is a death/doom metal project from São José dos Campos, São Paulo, Brazil, formed in 2021 by brothers Alexandre Paloschi (vocals, guitars, drum programming) and Henrique Paloschi (bass, guitars). The band's name is a tribute to victims of Unit 731, and their debut full-length "Bessa" (2022) — recorded, mixed, and mastered entirely by Alexandre Paloschi — was composed and produced in a home studio between August and December 2021.

Machinaria were a heavy/thrash metal band from Bagé, Rio Grande do Sul, Brazil. Their 2014 debut full-length Sacred Revolutions, Profane Revelations drew comparisons to second-wave American thrash acts such as Sacred Reich and Vio-Lence, and was built around a conceptual examination of the Catholic Inquisition. The album earned the band recognition as a standout name in the new generation of Brazilian thrash.

Machocabrio is a stoner and hard rock band from Chillán, Chile who debuted with their album Altibajos in July 2015. The nine-track record blends stoner grooves, rock and roll energy, and Spanish-language songwriting in a style rooted in the heavy rock tradition.

Macáes is a one-man post-black metal and shoegaze project by Fernando, based in Puerto Deseado, Santa Cruz province — one of the southernmost metal acts in Argentina. The project released the split Pureza y Caos alongside Chilean atmospheric act Lapageria Rosea in January 2013, contributing three tracks composed in July 2012: "Símbolo de Mutación," "Decadence," and "Condenados A Nuestra Iniquidad." The project blends black metal intensity with shoegaze texture in an ambient, atmospheric style.

Mad Billy is a solo grindcore project from Catanduva, São Paulo state, Brazil, launched in 2023 by the multi-instrumentalist known as Billy Grind. The project's debut release, the nine-track EP A Raw Tale Mad Max (2023), was conceived as a tribute to George Miller's Mad Max universe, with Billy Grind handling all instruments, vocals, mixing, and mastering himself.

Mad Chicken are a stoner/grunge metal quintet from Arcos, Minas Gerais, Brazil, formed in 2013, featuring Filipe Xavier on vocals, André Salviano on bass, Pedro Paim on drums, and Daniel Mudo and Carlos Macarrão on guitars. The band released their debut studio album Limestoner in 2017 and followed it with the EP Poultrygeist in September 2022 via Abraxas and Limestone Records, recorded entirely in an analog fashion in three days at ForestLab Studio in Paty do Alferes.

Mad Dog is a heavy metal and hard rock band from Buenos Aires, Argentina, led by guitarist Martín Knye — a veteran of Argentine metal who previously fronted LZ2 (1986–1989) and recorded the country's first neoclassical metal album, El fuego sagrado (1989), before stints in Kamikaze, Magiar, and KZ4. The band features vocalist Javier "Oso" Muñiz, drummer Adrián Micheli, and bassist Diego Magnacca, and released a three-track EP in 2016 ("Dios Del Asfalto," "Huestes," "Mad Dog") followed by the ten-song debut full-length Hell Raising Breed in April 2020. Knye has cited Black Sabbath, AC/DC, and Black Label Society as primary influences, describing the band's sound as "pure, hard, and brutal rock."

Mad Head Machine are a stoner/southern metal band from Joinville, Santa Catarina, Brazil, drawing on heavy metal, stoner rock, and Southern rock influences. Their 2018 release Snakes is a four-track record produced by Calamar Sounds in Florianópolis, featuring tracks such as "Stoner Head" and "Snake's Lair".

Mad Roulette are a heavy metal band from Rio de Janeiro, Brazil, formed in 2014, composed of Marcio Abud on guitar and vocals, Andre "Cheddar" on bass and vocals, and Marcos Soli on drums. The band released the full-length Turn the Wheel in February 2018 through MS Metal Records, delivering nine tracks of straightforward heavy metal with prominent riffs and forceful drumming.