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 Angel was a thrash metal band from São Bernardo do Campo, in the greater São Paulo metropolitan area of Brazil, formed in 1989 and active through the mid-1990s before splitting up. Operating as an independent underground act, the band was part of the wave of Brazilian thrash that flourished in São Paulo's industrial satellite cities during the late 1980s and early 1990s.

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 Evil is a one-woman Thrash Metal act from Quito, Ecuador, active since 2009 with the same member handling all instruments and vocals throughout the band's existence. The project released its debut demo Black Space in 2010 and full-length Multidimensional Past in 2019, signing with Triple Goddess Recs for the 2024 EP Saturnian Kult.

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 Storm is a thrash metal band from São Paulo with roots stretching back to 1986, when they operated under the name Exterminator in the city's northern suburbs before reforming under the current name in 1989. Their second album, Biotronic Genesis (1991), is regarded as a classic of Brazilian technical thrash metal, drawing comparisons to Testament and Forbidden with sci-fi and warfare lyrical themes. The band reunited in 2020 and continues to carry the torch of São Paulo's veteran underground thrash scene.

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.