2112 is a progressive rock and heavy metal band from Buenos Aires, Argentina, formed in 1986 and named in honour of the Rush album, which they pronounce in Spanish as "Veinti Uno Doce." The band has released five studio albums spanning from Alterando las divisiones (1990) to Nuestro mejor fracaso (2020), with guitarist Juan Tambussi and drummer Sergio Moscatelli as long-standing core members.

A heavy metal band from Fortaleza, Ceará, active from 2010 until their split-up. Operating out of the northeastern Brazilian metal underground, they released music through their Bandcamp page, blending traditional heavy metal within a scene more commonly dominated by extreme genres.

Aasimon is a heavy metal band from Niterói, Rio de Janeiro, active since at least the mid-2000s and one of the longer-running traditional metal acts from the Rio de Janeiro metro area. Their sound draws on classic heavy metal with a straightforward approach rooted in the Brazilian underground scene. They maintain a Bandcamp presence and remain active as of their last known activity.

Abiogenesis is a heavy metal band from Concepción, Chile, whose sound blends traditional heavy metal with hard rock, technical metal, and jazz-influenced passages. Their album "Eternos Laberintos" (2025) was recorded at El Cuartel del Músico in Concepción, produced by guitarist Eduardo Martínez alongside the band, and mixed and mastered by César González. The record is a conceptual work exploring the mental, emotional, and physical states of the human experience.

Heavy metal and punk band from Natal, Rio Grande do Norte, formed in 2012 and representing the northeast Brazilian underground scene. The band blended metallic riffing with punk energy in a region not traditionally known for a large extreme metal presence, though they have since split up and left minimal documented releases.

Abutre (Portuguese for 'Vulture') are one of São Paulo's early heavy metal bands, formed in 1982 by the Giudice brothers and bassist Tomas Catafay. The band contributed two tracks — 'Quando o Fogo Começa a Arder' and 'Rock Rock Rock' — to the landmark SP Metal II compilation on Baratos Afins in 1985, placing them among the pioneers of São Paulo's underground metal circuit before disbanding in 1986 and reuniting for anniversary events in 2015 and 2016.

Accipiter is a heavy metal band from São Paulo, Brazil, formed in 2014 and active in the city's underground traditional metal scene. With a minimal public profile, the band operates independently, carrying forward the São Paulo heavy metal tradition that has produced some of Brazil's most storied acts.

Acsa is a heavy metal band from Cipolletti, in the Patagonian province of Río Negro, Argentina, formed under their current name around 2014 after originating as Pucara in 2009. The band's lineup of Javier Burgos on vocals, David Ariel Rodríguez on guitar, Damián Zeballos on bass, and Alejandro Rodríguez on drums recorded their debut album "Sangriento Final" at Horus Estudio in Cipolletti in 2021. Their sound draws from the classic Argentine heavy metal tradition while aiming for a heavier, more original direction.

Adamah is a Christian heavy metal band from Carapicuíba, São Paulo, Brazil, founded in 2014 as a project by guitarist and composer Marcos Siqueira and vocalist Alex Souza. The band channels traditional heavy metal songwriting with lyrical themes drawn from faith, delivering driving riffs and melodic hooks.