Pasco 637 takes their name from a specific street address in Ramos Mejía, a suburb in the western belt of Greater Buenos Aires — the house of a woman named Nely 'Tata' Bruno, which served as an unofficial rehearsal sanctuary for local rock and metal musicians across multiple generations, dating back as far as the mid-1960s when bands like Los Grillos and Semilla de este Tiempo gathered there, the latter including musicians who would later surface in influential Argentine acts. By naming themselves after this address, Pasco 637 make a statement about continuity and belonging, locating themselves within a lineage of suburban Buenos Aires rock culture that fed the heavy metal scene throughout the 1980s and 1990s. The band's core formed in 1998 under the name Belzebuth, playing until 2004, and then regrouped and renamed in 2014 — meaning their actual musical relationship spans decades even if the Pasco 637 identity dates to their return. The current lineup includes Jerónimo Deiros on vocals, Demián Rugna and Juan Manuel Delgado on guitars, Ariel Simonetti on bass, and Walter Sosa on drums. Rugna is notable as an accomplished horror film director — his 2017 film 'Aterrados' (Terrified) earned widespread critical acclaim, winning Best Picture in the Horror category at Fantastic Fest, and his 2023 follow-up 'Cuando Acecha la Maldad' (When Evil Lurks) gained international distribution — and Pasco 637 has contributed music to several of his films, creating an unusual crossover between Argentina's underground metal world and its genre cinema scene. Their 2019 debut album 'Eterno en el Tiempo' blends material drawn from their 20-year catalog with newer compositions, reflecting the clear influences of Megadeth, Iron Maiden, and the Argentine groove metal tradition of Almafuerte. Reviewers noted the album's strong guitar interplay and Argentine-flavored rhythmic sensibility, with 'Catan' singled out as a highlight for its dynamic construction. Their sound distills the authentic suburban Buenos Aires heavy metal spirit — direct, groove-laden, and built to be played loud.

Paskinel is a heavy metal band from Avellaneda, Buenos Aires, anchored by Alex "La Parka" Paskinel on bass and backing vocals alongside vocalist Maikol Kramer, guitarist Nico Roa, and drummer Alejandro "Pelu" Rocha. The band recorded their self-titled debut album in 2019 at La Taberna Studio in Buenos Aires, with mastering handled at Charlone Studio.

Passional arrived from Belém's underground in 2023 with a short, prolific burst of doom-soaked death and thrash metal, releasing multiple records in rapid succession including I Cry... Tears of Blood and Sweet Revenge... To Kill You After My Death. Their material orbits crimes of passion, emotional devastation, and the violence that can emerge from betrayal, with extended compositions that sit at the bleaker, slower end of the death-doom spectrum.

Led by vocalist Mario Pastore alongside guitarist Rafael Gazal, Pastore deliver traditional heavy metal rooted in the classic European mold — melodic, anthemic, and built for the long song. Their catalog includes The Price for the Human Sins and the 2017 album Phoenix Rising, the latter released on the Japanese label Spiritual Beast, and the band has appeared on tribute compilations honoring both Helloween and Iron Maiden.

A fixture of the Belo Horizonte extreme metal underground, Pathologic Noise deal in gore-soaked brutal death metal with a relentless low-end attack and guttural vocal savagery. Their debut full-length "Sodomy and Delight on Flesh" (2003) on Cogumelo Records established their punishing formula, which they sharpened further on "Gore Aberration" (2014).

Founded by Mantus and Triumphsword — veterans of the local black metal outfits Mysteriis and Thorns of Evil — Patria weaves South American ferocity with the cold, atmospheric currents of Scandinavian black metal. The band built a substantial catalog across the 2010s, with albums like "Sovereign Misanthropy" (2010) and "Individualism" (2014) drawing notice for Triumphsword's commanding vocals and an unflinching focus on misanthropy and anti-religious darkness.

Patriarchy was a black metal project from Buenos Aires that operated briefly from 2019 until splitting up not long after, existing entirely within the shadows of Argentina's substantial but largely unsung black metal underground. Buenos Aires has produced a diverse range of black metal acts across the decades — from the raw, primitive hordes of the 1990s who absorbed the Scandinavian second wave almost in real time through underground tape trading, to more recent projects exploring atmospheric, ambient, and post-black metal territories. The name Patriarchy, deployed by a black metal band, sits in an interesting space: it could represent a straightforward adoption of dark thematic imagery common to the genre, an ironic or critical gesture toward social power structures, or simply a provocative moniker in the tradition of Argentine black metal bands who favor confrontational names. Black metal in Buenos Aires has historically operated through small dedicated zines, tape labels, and underground shows — a world largely invisible to the mainstream music press but fiercely self-sufficient. Patriarchy's brief existence and subsequent dissolution follows a familiar trajectory for underground black metal projects globally: intense but short-lived, leaving a limited trace in the public record beyond their Encyclopaedia Metallum entry and whatever recordings they produced during their active period. Their registration with an active Bandcamp URL suggests at least some material exists in digital form for those willing to seek it out.

Patricide is a father-son death/groove metal project from Buenos Aires that weaves in djent and doom textures. The band released their album Scelerate in 2025, a twelve-track effort showcasing their dense, technically oriented approach to extreme metal.

Patricio Stiglich Project is a progressive metal and rock band from Bogotá, Colombia, active since 2010. The project has released five full-length albums, most recently "5" in 2024, alongside several EPs and singles exploring themes of life and humanity. Notably, they opened for Megadeth at the band's Bogotá show on September 2, 2012.