Maten al Rey is a melodic heavy metal and hard rock band from Quilmes, Buenos Aires, Argentina, composed of vocalist and guitarist Sergio Goddio, bassist Alejandro López, and drummer Leonardo Rodaro. The band — whose name translates as "Kill the King" — released the album "Mar Adentro" in October 2018, produced by Marcelo Vázquez. They operate as an independent act and are listed in Metal Archives under the Argentine power metal scene.

Mathrem is a Death Metal band from Ambato, Tungurahua, Ecuador. Their 2019 release "Profecias y Ruinas" established them as an independent act working within the Ecuadorian underground extreme metal scene. The band operates without label support, self-releasing their material on Bandcamp.

Matricidium plays straight-ahead thrash metal rooted in the aggressive tradition of early Brazilian and US thrash, releasing their debut album 'Rise the Army' in 2012 through MS Metal Records and following it with an expanded European edition in 2014. In October 2015 the band completed their first European tour across nine countries, playing 15 shows in 23 days and establishing themselves beyond the domestic circuit.

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.

Mausoleum were a death/black metal outfit from São Paulo whose lyrical themes circled around paganism and occultism, a common thread running through releases spanning compilations such as "Southern Warriors Cult #1" (1999) and "War... Satanic Victory!!!" (2003). Their output also included "10 Anos de Bestial Massacre" in 2004 and "O Retorno à Batalha" in 2006, cementing a two-decade presence in the Brazilian underground before the band eventually dissolved.

Maverick channel groove-heavy riffing through a thrash and metalcore lens, with socially charged lyrics that address dehumanization and internal conflict. The band built a steady catalog including "Quid Pro Quo" (2014), "Cold Star Dancer" (2018), "Ethereality" (2021), and "Silver Tongue" (2024), demonstrating consistent growth in both production and songwriting since their founding by vocalist/guitarist Gabriel Sernaglia and drummer Gustavo Polississo.

Mawashi Geri fuse progressive death metal with the atmosphere and mythology of traditional Japanese culture, drawing on legends of the underworld for their lyrical and sonic identity. Their 2022 debut album "Yomi Yokai" is a concept record built around creatures from the Japanese realm of the dead, pairing technical death metal structures with distinctly Eastern melodic textures across eight tracks.

Mawiza is a Mapuche metal band from Wallmapu, Chile, formed in 2021 as the successor to Nunca Seremos Dichosos—a project that won the Pulsar Award (Chilean Grammy) for Best Metal Artist in 2020 for the album Kollong (2019). Performing in Mapuzungun, their ancestral language, and integrating traditional Mapuche instruments and rhythms into groove metal and metalcore, Mawiza have drawn international attention from acts including Slipknot and Gojira, the latter's Joe Duplantier appearing on their debut album ÜL (2025) on Season of Mist. Their work is as much a statement of Indigenous cultural preservation as it is a metal record.