Aliwen is a melodic metalcore band from Quilmes, in the Buenos Aires metropolitan area, formed in 2016. The band self-released an EP in 2017 under their own name, establishing themselves as an independent act within Argentina's growing metalcore scene.

Alkahest was an atmospheric black metal project from Minas Gerais, Brazil, active from 2011 until their split-up. Operating in the same rich Minas Gerais underground that produced seminal Brazilian extreme metal acts, the project explored atmospheric and ambient-influenced black metal with themes rooted in occultism, ritual, and the spiritual — a direction consistent with the atmospheric black metal current emerging across Brazil in the early 2010s. The band remained unsigned throughout their existence.

Alkimistal is a São Paulo-based metal act working the intersection of melodic death metal, thrash, and metalcore. Their Bandcamp release 'Reflections' showcases the blend of harsh riffing and melodic hooks that defines their sound within São Paulo's underground scene.

Alkymenia is a thrash metal band from Caruaru, Pernambuco, formed by three brothers — Sandro Silva, Lalo, and Dennis — who have built one of the most consistent careers in the northeastern Brazilian underground. Their 2023 album 'Meeting Before the Death' was recorded with producer Tue Madsen (Meshuggah, Behemoth) at Antfarm Studio in Denmark, and the band has toured Europe across 12 shows in 8 countries.

All Belong to Us is a metalcore band from Santa Cruz de la Sierra, Bolivia, whose lineup has included vocalists, dual guitarists, bass, and drums across their recorded output. They have released the EP First of All, the single Inmortalized, and the full-length Before the Darkness Comes, establishing themselves as one of the few metalcore acts in the Bolivian underground scene.

All I Hate is a death metal duo from Sorocaba, São Paulo state, composed of Lucas Berti and Elcio Junior. Since forming in 2021 they have been remarkably prolific, releasing multiple records including 'Soulless Gods Arise', 'Manifesto', and 'Circus', carving out a stripped-down, punishing approach to the genre.

Alliance is a progressive power metal band from Fortaleza, Ceará, bringing the melodic ambition of the genre to Brazil's northeast. Formed in 2014, they sit within a tradition of Brazilian power and prog metal acts known for technically ambitious compositions and soaring vocals.

Allmadda is a progressive thrash metal act from Rio de Janeiro whose debut album 'Majestic Sound of the Storm' (2015) weaves macabre keyboard textures through nine densely constructed tracks, some exceeding nine minutes, drawing on both progressive structure and thrash aggression in equal measure.

Allos is a progressive power metal band from Belo Horizonte, Minas Gerais, blending the speed and harmony of power metal with sophisticated prog technique and symphonic elements. Their 2024 album 'Strong Delusion' features guest appearances from Christian Liljegren of Swedish veterans Narnia and Rob Rock of Impellitteri, and was mixed by Thomas 'Plec' Johansson, signaling the band's growing international reach.