A traditional heavy metal outfit from Sorocaba, São Paulo, Maligna operated within the classic mold of melodic riffing and anthemic song structures before disbanding. Their work reflected the enduring influence of 1980s heavy metal on the Brazilian underground circuit.

A short-lived São Paulo act, Maligun worked the intersection of metalcore and traditional heavy metal during their active years between 2013 and 2019, drawing on the city's rich lineage of heavy music while incorporating the rhythmic aggression of the metalcore idiom. The band remained independent throughout their existence before eventually splitting up.

Manifiesto is a thrash and heavy metal band from Morón, Buenos Aires, led by guitarist Cristian González, with a catalogue that spans from their first album Insano (2006) through La Obra Maestra del Odio (2015) to La Ley del Talyon (2024). After nearly a decade between studio records, the band's 2015 comeback album was reviewed across Argentine metal media including Metal-Daze Webzine and Metal Argento, cementing their standing in the local scene.

Mantra Heavy Metal is a heavy metal band from Buenos Aires, formed in 2001 by vocalist Eduardo Paredes, guitarist Walter Sobrero, bassist Ramiro Cora, keyboardist Luis Cosenzo, and drummer Ariel Behrend. The band self-released a seven-track demo in 2003 and returned a decade later with the full-length Perder Para Ganar in 2012.

Mar Muerto is an experimental metal band from Antofagasta, Chile, formed in 2017. Rooted in heavy metal, the band incorporates experimental touches spanning classical music, progressive structures, and black metal influences. Their 2020 EP Shub-Niggurath, a seven-track release drawing on Lovecraftian themes, stands as their primary recorded output to date.

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.

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.

Matvey is a traditional heavy metal band from Rosario, Argentina, featuring vocalist Pablo Podesta, guitarist Diego De Santiago, bassist Marcos Sartori, and drummer Mariano Gauna. The band released "Reinando entre colinas" independently in 2012, a Spanish-language epic metal album drawing on Nordic mythology, which was later reissued in 2014 by Electric Punishment Records of Rosario. They shifted toward 1980s US heavy and speed metal influences on their 2019 album "Evil Force and Wild Street", released through Thundersteel Records, and have performed live in both Argentina and Spain.

Maurício Filho is a São Paulo-based shred guitarist whose instrumental work blends heavy metal riffing with technically demanding lead guitar. His discography includes releases such as "The Pumpkin Night" EP and the 2020 album "Season of the Mad Pumpkin," which showcase his high-speed picking and melodic sensibility rooted in the classic shred tradition.