“Gal Costa was among the world’s best singers, among our principal artists to carry the name and sounds of Brazil to the whole planet,” President-elect Luiz Inácio da Silva said.

Gal Costa, an adventurous musician who was a pivotal figure in Brazil’s Tropicália movement in the 1960s, has died. She was 77.

Costa, born Maria da Graça Penna Burgos, died Wednesday, according to the Associated Press, which cited a press representative for the singer. No cause of death or additional details were provided.

“It is with deep sadness and a broken heart that we announce the death of singer Gal Costa this Wednesday morning, Nov. 9, in São Paulo,” said a statement posted to her official Instagram account. “Details on her wake and funeral will be shared at a later date. We appreciate everyone’s caring thoughts during this very difficult time.”

According to CNN, Costa had been recovering from a nasal surgical procedure over the last three weeks and was scheduled to perform at the Primavera Sound festival in São Paulo last weekend. But she had to cancel, and her next concert was scheduled for Dec. 17, the AP reported.

The iconic singer, who was well known for her fusion of different genres, burst onto the Brazilian music scene alongside future legends Caetano Veloso, Gilberto Gil and Maria Bethânia. Costa was also a prominent proponent of Brazil’s Tropicália (or Tropicalismo) movement, which blended musical styles in the 1960s, including traditional and avant-garde sounds.