Sin Piedad is a death-thrash metal band from Rosario, Santa Fe, Argentina, whose lineup includes Javier Minniti on vocals, Marcos Solini on guitar, Gabriel Zubiri on bass, and Diego Bordon on drums. The band released the three-track EP "Resistencia" in May 2021, recorded and mastered by Cristian D'Alessandro at Gnosis Studios in Rosario. With themes rooted in social and political struggle, the EP drew praise from the underground metal community for its aggressive guitar tone and creative approach to the genre.

Sin Pudor is a thrash metal and punk band from Bogotá, Colombia, active since 2005. They released the EP "Lasciva Intoxicación" in 2015 and have issued several singles and split releases, with lyrical themes centered on LGBTQ+ rights, gender expression, feminism, and anti-fascism. The band operates independently and has built a catalog of politically charged material through digital releases on their Bandcamp page.

NWOTHM band from Paraíba, Brazil, started in 2015 as a solo project by guitarist and vocalist Leonardo Felipe before expanding to a full lineup featuring Victor Laudelino on bass, Erivan Letal on guitar, and Ricardo Batera on drums. The band recorded their debut album Herdeiros in 2019 and followed it with Ao Anoitecer in May 2024, singing entirely in Portuguese.

Sincope is a thrash/crossover hardcore band from Buenos Aires, Argentina, featuring Gaby on vocals, Bava on guitar, and Pela on drums. The band has released three studio albums: "Nuestra Generación" (2004), "Carroña" (2013), and "Somos Culpables" (2016), all independently produced and self-managed. Their music addresses social and political themes from a working-class perspective, and they have sustained over two decades in the Buenos Aires underground scene.

Sinergia is a heavy metal band from San Francisco, Córdoba province, Argentina, composed of Raúl Amsler on vocals, David Degano on guitar, Gastón Rosa on bass, and Carlos "Colifi" Contrera on drums. The band released their debut studio album, "Dispuestos a seguir," in 2021, and have performed regularly at regional venues and motorcycle rallies in Córdoba and Santa Fe, including a notable support slot for Argentine heavy metal legends Rata Blanca. A second album was recorded between December 2023 and July 2024 at Estudios Panda and García Estudio.

Deathcore band from Conselheiro Lafaiete, Minas Gerais, formed in 2024, with Jean Silva on guitar, Diego Andrade on bass, and W.A.R. handling vocals as a session contributor. The band released their debut EP 7 in August 2024, a two-track digital release featuring "Melody of Hate" and "VII Rivers."

Heavy metal band from São Paulo, formed in 2018, featuring Nando Fernandes on vocals, Edu Ardanuy on guitar, Luis Mariutti on bass, and Rafael Rosa on drums. Mariutti, a founding member of both Angra and Shaman and a twelve-time winner of Brazil's best bassist award, anchors the rhythm section on the band's self-titled debut album, released in November 2022 and produced at Orra Meu! Studios.

Sinner's Blood is a melodic heavy/power metal project from Santiago, Chile, built around Chilean producer and multi-instrumentalist Nasson and featuring Chilean vocalist James Robledo, known for his work with Renegade (Chile) and Thabu (Argentina). The band released their debut album The Mirror Star on Frontiers Records, drawing on the emotional and vocal traditions of Ronnie James Dio, Jorn Lande, and Russell Allen.

SinSilencio is a progressive metal band from Santiago, Chile — the name translates from Spanish as "WithoutSilence." Their 2016 album Toroide is their second studio full-length, following a trajectory of intricate, Spanish-language progressive rock and metal.