It's … the Fattoruso brothers from Montevideo! And João José Pereira "Raul" de Souza from Rio de Janeiro! As produced by Airto Moreira!
http://www.acerecords.co.uk/content.php?page_id=59&release=8733
http://www.acerecords.co.uk/content.php?page_id=59&release=8731

Opa: "Groove" (1977)

Opa: "Totem" (1977)

Raul de Souza: "Dr Honoris Causa" (1974)