Amargo is a Brazilian raw black metal solo project by Victor "Oguh" Ramos, who handles all instruments, vocals, and lyrics. Rooted in the tradition of second-wave black metal with acknowledged influences ranging from Burzum and Darkthrone to local acts Sarcófago and Mystifier, the project released its debut album "Processo de purificação" in 2015 on the Ad Eternum label, blending lo-fi atmospheric black metal with dark ambient elements. A subsequent split with Kav was released through Wolfmond Production, cementing Amargo's place in Brazil's underground raw black metal underground.

Amazarak is a São Paulo black metal band with roots going back to 1997, when they operated under the name Mandragora before adopting their current name around 2001. The band deals in Satanic and anti-Christian themes, and their discography includes the 2009 full-length "Ascensão do Anticristo", a 2016 split with Nervochaos, and the 2023 release "Impuro Armagedom". Tracks like "Hino de Blasfêmia" and "Comando Blasfêmia" have circulated widely in Brazilian underground metal circles.

Amazon is a melodic heavy metal and rock band from Valinhos, São Paulo, Brazil, playing a style influenced by European power and melodic metal traditions with a focus on themes of love, fantasy, and Brazilian culture. The band is associated with Ravenheart Music and was previously known as Silent Saga. Their sound sits in the melodic and accessible end of the Brazilian heavy metal spectrum.

Ambition is a heavy metal and hard rock band from Curitiba, Paraná, Brazil, playing a straightforward blend of classic heavy metal riffs and hard rock energy. The band released material through Infernö Records, a French underground metal label known for promoting underground acts. They represent Curitiba's growing metal scene, a city that has produced a number of important Brazilian black and extreme metal bands.

Ambivalentt is a groove and thrash metal band from São Paulo, Brazil, formed in 2018. The band released a self-titled EP in April 2018, drawing on the city's rich tradition of crossover and groove-inflected thrash. São Paulo's dense metal underground has long been a hotbed for thrash acts pushing toward heavier and more rhythmically aggressive territory, and Ambivalentt fits squarely within that lineage.

Amduat is a death metal solo project from La Paz, Bolivia, created by multi-instrumentalist Gino (Hor) Torrico, who handles drums, guitars, bass, and vocals. The project's debut full-length Paths of the Psyche, recorded at Estudio Powersound in La Paz and released in 2022, draws on themes of occultism, witchcraft, nature, and consciousness within an extreme metal framework.

Ameaça Nuclear — Portuguese for "Nuclear Threat" — was a death metal and grindcore band from São Paulo, Brazil, active from 2020 until their split. The band operated in the tradition of São Paulo's brutal underground extreme metal scene, blending the raw aggression of grindcore with death metal's heavier structures. Their Bandcamp presence documents their brief but intense run in the city's tightly knit extreme metal circuit.

Amen Corner is one of the pioneering black metal bands in Brazil, formed in 1992 in Curitiba, Paraná, and widely regarded as a foundational force in the development of the country's extreme metal underground alongside acts like Murder Rape. Drawing influence from Venom, Celtic Frost, and Bolt Thrower, the band forged a sound characterized by diabolic weight and aggression, releasing landmark early albums including "Fall, Ascension, Domination" (1994) and "Jachol Ve Tehilá" (1995). Their 2024 album "Written by the Devil", released through Dutch label Hammerheart Records, marked their first international licensing deal after over three decades of activity.

Amenaza is a heavy metal band from José C. Paz, Buenos Aires, Argentina, who released their self-titled debut in June 2020. The tape-released album spans 17 tracks and showcases the band's raw approach to traditional heavy metal within the greater Buenos Aires underground scene.