Five decades after galvanizing the Brazilian music scene with the "Tropicalia" movement, Gilberto Gil and Caetano Veloso are going back on tour, older and wiser but still border-blurring troubadours. Gil, a politically engaged musical ambassador who once served as Brazil's culture minister, and Veloso, a wispy, gender-bending poet with a sublimely mellow voice, have been friends and collaborators since 1963. Caetano and Gil, as they are popularly known, shook the foundations of Brazilian music in the 1960s with Tropicalia, which blended the South American nation's samba and bossa nova sounds with rock-and-roll beats, electric guitars and psychedelic experimentalism.

Source: Yahoo Music
Link: Brazilian music icons Caetano, Gil back on tour at 72