RIO DE JANEIRO — Singer Gal Costa, an icon in the Tropicalia and Brazilian popular music movements who enjoyed a nearly six-decade career, died on Wednesday. Her death was confirmed by a press representative, who provided no further information. Their joint side project became an important counterculture reference during Brazil’s two-decade military dictatorship, inspiring a record, tour and documentary. In 2011, Costa was awarded a Latin Grammy Lifetime Achievement Award. She remained an active performer until nearly the end, having recently suspended shows to undergo a surgery on one of her nostrils.

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