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.

Aceldama is a stoner/doom duo from Quilmes, Buenos Aires, Argentina, built around guitarist and vocalist Ayatola el Infame and drummer El Musulmán. Their 2023 release "Demasiado tarde..." — recorded at El Portón studio — stretches across four sprawling tracks including the ten-minute closer "Estramonio," sitting comfortably in the heavy psychedelic and doom tradition. The album's full subtitle, referencing being "too late to think about God," signals the band's bleak, riff-driven worldview.

Acid Blood is a thrash metal band from Brasília, Distrito Federal, Brazil, active in the capital's relatively compact but dedicated underground metal scene. The band operates independently, delivering straight-ahead thrash metal that draws on the classic Brazilian and international thrash traditions cultivated since the 1980s.

Acid Brigade was a thrash metal band from Londrina, Paraná, Brazil, active from 2016 to around 2019. They released the demo "Addiction to Distortion" in 2016 and followed it with their full-length "Storming Into This Land" in 2019, a record tracked at Toque Grave Estúdio and noted for its palm-muted riffing and old-school new-wave-of-thrash energy.

Acid Funeral is a Brazilian black/doom metal duo formed in 2024, consisting of vocalist Niili and multi-instrumentalist Billy Grind. Released through the DIY label Podreira Records out of Catanduva, São Paulo, their debut EP "The Doom Cult" (2024) fuses corrosive black metal atmosphere with slow doom riffing under the self-described banner of "Doom Rituals on Acid."

Acid Satan is a five-piece metal and punk fusion band from La Rioja, Argentina, formed in early 2023, featuring Kevin Satan on vocals and guitar, Mati Argonaut on guitar, Neri Blackmass on keys and vocals, Pablo Fat Pipe on bass, and Pablo Kdk on drums. Their debut EP "Doomed Junkies," released September 28, 2023 and recorded in the Matadero neighborhood of La Rioja, contains six tracks exploring themes of witchcraft, paranoia, and dark psychedelia. The band fuses crossover thrash energy with stoner heaviness and lysergic textures uncommon in Argentina's northwest.

Acid Trip is a four-piece progressive and stoner metal band from Valdivia, Chile, formed in 2010, comprising Felipe Mendoza (guitar/vocals), Sergio Hinojosa (guitar/vocals), Nicolás Mendoza (bass/vocals), and Felipe Valencia (drums/vocals). Their debut album "Volumen Uno" was released on December 9, 2024, recorded at Estudios MonteRanco in Futrono, and features singles including "Hombre Elefante," "Mary Jane," and "Cabalgata en el Apocalipsis." The record received positive reception across the Chilean metal and rock press.

Acidemia is a stoner/doom trio from Lages, Santa Catarina, Brazil, formed by Henrique Soares (bass/vocals), Mateus Varela (guitar), and Thiago Granetto (drums), drawing heavily from Electric Wizard and Monolord. Their 2021 album Podridão marked a shift toward compositions entirely in Portuguese, blending sludge-inflected doom with psychedelic heaviness across seven tracks. The band has been featured on the Weedian-curated Trip to Brazil compilation, placing them among the notable voices in Brazil's growing stoner/doom underground.

Acrament was a death metal band from Santiago, Chile, active from the early 1990s until their split. The band's lineup included Christian Asenjo on vocals and guitar, Daniel Muñoz on lead guitar, Dario Díaz on bass, and Luis Pinto on drums. Their 1995 promotional demo "Lands of Blood" stands as their sole documented release.