Buccal Defecation is a brutal death metal band from Quilmes in the Buenos Aires province of Argentina, active in the local extreme underground since at least 2002. The band released a Demo in 2002, the Vaginal Rotten EP in 2011, and the full-length Testament of Brutality in 2014 through Grinder Cirujano Records, and also appeared on the split 3 Ways of Perversity alongside fellow Argentine acts Annihilate and Butcher.

Budasses is a stoner/doom metal project from Villa Lo Errazuriz, Maipú, formed from the ashes of the band Sahumerio. The group released their self-titled demo in 2012 through Proyecto Sepulcro, and later appeared on a 2021 split with Saturno titled "Kura Kütral Ko," tagging their sound as acid weed metal and doom stoner.

Buena Muerte is a death metal band from Florencio Varela in the Buenos Aires metropolitan area of Argentina, featuring guitarist and vocalist Favio Leguizamon alongside bassist Jose Manuel Araujo and drummer Hector Benito Paz. The band released the Dios Es Sádico EP in 2018 and the full-length album Catalepsia in 2024, building a steady presence in Argentina's underground death metal scene over two decades.

Buffalo is a stoner metal band from Buenos Aires, Argentina, formed around 2002 by guitarist and vocalist Claudio Filadoro following his tenure as bassist in legendary Argentine desert rockers Los Natas. The band has released six studio albums including their debut Temporada de Huracanes (2002), Karma (2005), and Parálisis (2018), blending heavy stoner riffs with 1970s hard rock influences across a catalog spanning nearly two decades.

Bullet Course is a doom and post-metal band from Curitiba, Paraná, Brazil, formed in 2011. The band blends dissonant guitar work with themes of existential emptiness, drawing on blackgaze and experimental rock influences alongside their doom and post-metal core. They have released three albums — "Without Memories," "Into the Solitude," and "She's Looking for Flowers Under City Light" — and performed at the Eclipse Doom Festival in São Paulo.

Bulletback is a heavy metal band from São Paulo, Brazil, active in the Brazilian underground metal scene. The band has contributed to notable Brazilian tribute compilations, performing "Where Eagles Dare" on the 2020 double album "Somewhere in Brazil – The Brazilian Tribute to Iron Maiden" and "World Painted Blood" on the 2021 "Brazil Painted Blood – The Brazilian Tribute to Slayer."

Burial was a thrash/death metal band from Guarujá, São Paulo, Brazil, formed in 2005 and now split up. The coastal São Paulo city of Guarujá has a longer underground metal history, with an earlier local act of the same name releasing a demo as far back as 1991, but this incarnation operated in the 2000s before disbanding.

Burial Temple is a death metal band from Brasília, Brazil, whose music is centered on themes of necrolatry, funeral rites, and death worship. The band released their debut demo "Mortal Scum" in 2019, recorded live at Texas Studio in Brasília, and the recording was released in 2020 through underground label Cianeto Discos. They describe their sound as "an agonizing threnody of misery; a passionate ode to Death and its infinite ways."

Buried in Corpvs is a metalcore band from Santiago, Chile, formed in 2015. The band released the EP "Catharsis" as their debut, a six-track effort that established their presence in Santiago's heavy underground scene.