Ass Flavour is a death/grindcore band from Vila Velha, Espírito Santo, active since 2005 and known for gore-drenched splatter-death metal in the tradition of Carcass, Pungent Stench, and Cannibal Corpse. Their 2015 album Dirty Procedure showcases ultra-fast drumming and multi-timbred growling vocals alongside pathological themes, and members have since branched into related projects including the death/black metal act Impugnant.

Assassinato is a raw black metal band from São Paulo, operating in the Brazilian black metal underground since 2018. Their Bandcamp catalog includes releases such as Hellarsal, Spiritual Rites to Extinction, and Black Iron Paganism, titles that signal a commitment to orthodox, lo-fi black metal aesthetics rooted in occult and adversarial themes.

Assault is a speed/thrash metal band from Vitória da Conquista, Bahia, formed in 2021 and playing in the aggressive tradition of Brazilian thrash metal. Operating out of the interior of Bahia — a state better known for axé and forró than thrash — the band channels the raw, high-tempo aggression of the genre with themes rooted in misanthropy and anti-religious sentiment.

Assembler is a progressive power and groove metal band from Maipú, Chile, formed in 2014 under the name Jala el Gatillo before adopting their current name. In 2021 they released their debut album Serendipia, an eight-song record blending melodic metal with theatrical elements, recorded and mixed at Estudios Arrebol by Felipe Cuevas.

Astaria is a traditional heavy metal band from the greater Porto Alegre area of Rio Grande do Sul, formed in 2019 across the neighboring cities of Cachoeirinha and Porto Alegre. The band draws from the classic heavy metal canon in the vein of bands that shaped the strong gaúcho metal scene, with clean vocals and melody at the forefront of their approach.

Astaroth Cult is a one-man melodic and atmospheric black metal project from Minas Gerais, Brazil, the work of solo musician Patryck Leal who handles all instruments, vocals, and lyrics. Formed in 2020 and rooted in the DSBM and raw atmospheric black metal underground, the project released its debut album Return of the Falls in November 2020, blending depressive and Satanic lyrical themes with melodic riffing and cold, harsh production.

Asterean is a melodic black/death metal band from São Paulo, Brazil, that traces its roots to 2011 through a predecessor project called Espera XIII before formalizing under the current name around 2020. The four-piece — featuring Renan Brito on guitars, vocals, and keyboards alongside Fernando Henrique Ribeiro on drums — released their debut full-length Cosmorama in July 2022, a 33-minute record blending nature-themed black metal atmospherics with crushing riffs and cosmic imagery, followed by the Sovereign EP in 2024.

Asterias is a stoner/sludge metal band from San Juan, Argentina, featuring Diego Oliver and Juan Montané sharing guitar and bass duties alongside Rodrigo Cardozo on guitar and Pedro Romano on drums. The quartet released Hijo de una Tormenta in 2021, a record that channels the heavy, riff-driven energy of South American stoner rock into dense, atmospheric territory.

Asteroidea was an instrumental progressive metal and shred band from Salvador, Bahia, founded in 2001 by guitarist Patrick Amorim — the name itself derived from the Latin word for the starfish class. Heavily influenced by guitar virtuosos Joe Satriani, Steve Vai, and Yngwie Malmsteen, the group focused on technically demanding original compositions rather than vocals, recording the demo Furthering Your Imagination in 2002 before eventually disbanding.