Hefesto is a Buenos Aires heavy metal band that built their debut around the concept of the seven deadly sins, releasing a series of singles — Ira and Avaricia in 2022, Soberbia and Envidia in 2023 — culminating in the full-length debut Pecados Capitales in 2026. Vocalist Jaime described the project as reinterpreting Dante's framework through a contemporary lens, treating the sins not as moral condemnations but as expressions inherent to human nature. The band is active on Spotify with around 95 monthly listeners and 179 followers.

Helker is a heavy/power metal band from Buenos Aires founded by guitarist Mariano Ríos and featuring vocalist Diego Valdez, widely regarded as one of Argentina's premier metal exports. The band released three Spanish-language albums — "Legado Secreto" (2001), "Resistir" (2008), and "A.D.N." (2010) — before signing with Germany's AFM Records for their English-language debut "Somewhere in the Circle" (2013) and "Firesoul" (2017), touring alongside Primal Fear, HammerFall, and Gamma Ray.

Hellhoundz is a heavy metal band from Fortaleza, Brazil, formed with the stated goal of producing original music rooted in the New Wave of British Heavy Metal tradition, citing influences including Iron Maiden, Judas Priest, and Saxon. The band released a self-titled EP in 2018 and followed it with the debut full-length album The Battle of the Somme in December 2019, which received international attention and was made available on Bandcamp and Spotify.

Hellway Patrol is a heavy/thrash metal power trio from Londrina, Paraná, Brazil, formed in 2017 by vocalist and bassist Ricardo Pigatto, guitarist Thiago Franzim, and drummer João Bolognini. The band crafts post-apocalyptic and dystopian-themed metal, releasing the EP "Desert Ghost" in June 2018, followed by their self-titled EP.

Hellway Train is a hard rock and traditional heavy metal band from Belo Horizonte, Minas Gerais, Brazil, relaunched in 2020 by founders Marc Hellway and Vinicius Thram with a renewed focus on classic 1980s heavy metal sounds. The band released the EP "Lockdown Reborn" in November 2020 and their debut full-length album "Borderline" in 2024 via Classic Metal Records.

Hernán Cirigliano is a guitarist and composer from Hurlingham, Argentina who self-produces his progressive and heavy metal recordings, handling guitars, keyboards, and drum programming. His 2019 album "Tormenta Solar" features a keyboard solo by Dream Theater's Derek Sherinian on the track "El Dato Sería Clave," with bass, mixing, and mastering handled by Marco Ignacio Toba.

Hevilan is a heavy/symphonic metal band from São Paulo, Brazil, founded by guitarist Johnny Moraes. Their debut album The End of Time was released in 2013 in Brazil and Japan, and later picked up by Massacre Records for a European release in 2015, earning the band spots opening for Masterplan and Edu Falaschi. A second full-length, Symphony of Good and Evil, followed in 2021.

Hidrommel is a heavy metal band from Lavras, Brazil, formed in 2022. The band released their debut album We Are the Seas in 2024, a ten-track record that draws on classic heavy metal traditions with a seafaring lyrical theme spanning tracks such as "Pirates of 21st Century," "Sirena's Call," and "Natural Born Drinkers."

Holder of Souls is a heavy metal band from Bragança Paulista, São Paulo, Brazil, formed in 2019. The band's lineup includes Daniel Bueno on vocals, Tiago Schievenin and Rafael Cintra on guitars, Emerson Paulo on bass, and Daniel Franco on drums. They released their self-titled debut album in September 2019, a nine-track effort spanning just under 52 minutes.