Costa’s collaborations with Caetano Veloso and Gilberto Gil helped define Brazilian popular musicGal Costa, the iconic Tropicália and música popular brasileira vocalist, has died, The Associated Press reports. A cause of death was not revealed, but the singer was recently forced to cancel a performance at Primavera Sound’s São Paulo festival after undergoing surgery on one of her nostrils. Costa was 77 years old. Costa is considered a leading figure in Tropicália, the multi-disciplinary countercultural movement spanning popular music, theater, film, poetry, and visual art in Brazil. The movement developed in response to the military dictatorship that lasted from...