After a best mate of mine introduced me to Fela Kuti’s works I’ve been real interested in hearing music from other cultures you don’t hear much stuff from. Doesn’t have to be traditional music styles (love it when genres and cultures fuse together, like Masayoshi Takanaka taking influence from Brazilian music), but I’d love to hear that as well!
Traditional Argentinian music: Soledad or Los Chalchaleros
Traditional Brazilian music: Chico Buarque or Caetano Veloso
Traditional Brazilian music from the northeast: Luiz Gonzaga
Argentinian Rock from the 60/70: Sui Generis or Pedro y Pablo
Brazilian Rock from the 60/70: Cazuza or Raul Seixas
Argentinian contemporary music: Bersuit Vergarabat
Contemporary Brazilian Rock (there are tons of metal bands from Brazil, like Angra, Sepultura, Shaman, etc, but I want to point out one in specific): Matanza (although I would describe them more as a hardcore us country style than rock, they sing mostly in Portuguese so it has a very unique style)
Comedy music is a great view into a society, so as a bonus:
Argentinian homemade instrument band: Les Luthiers (this one is a YouTube link because realistically you want to see these guys, not just hear them)
Brazilian Metal joke band: Massacration