Death/thrash metal solo project from Teresina, Piauí, run by Stephen Lemos, who handles all instruments and vocals. Lemos revived the project in 2018 after an eleven-year hiatus from its original 2007 formation, releasing the Primeira Demo in 2019 and the self-titled EP in 2023, with lyrics focused on political and religious criticism.

Sin Anestesia is a thrash metal band from Comodoro Rivadavia, Chubut, Argentina, with a lineup featuring bassist Nacho Carzoglio, guitarist Fuentes, and drummer Casanova. The band released their debut EP, "Nunca Seré Parte," in 2020 across digital platforms and followed it with a CD release in 2021 through The Ragged Records Music. Drawing on the old-school thrash sound of acts like Anthrax and Overkill, the five-track EP established them as part of Argentina's active underground thrash scene.

Sin Destino is a heavy metal band from Grand Bourg, Buenos Aires province, Argentina, with a lineup of Rafa on vocals, Miguel and Jeremías on guitars, Raúl on bass, and Joaquín on drums. The band released their debut full-length album, "Siguiendo Nuestro Camino," in 2014, establishing themselves in the Argentine underground heavy metal scene. They have remained active as an independent act and continue to perform in the Buenos Aires region.

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."