Miucha, who treated lung cancer, died of cardiovascular arrest, reported Brazilian media.
She has signed 14 albums for 40 years of career, combined with several styles – bossa-nova, samba and folk song. Known especially as an interpreter, she also composed songs such as "Sad Alegria" (1979), "Todo amor" (1980) or "No Carnival by Olinda" (1982).
Born of Heloisa Maria Buarque of Holland, she was the sister of the famous singer Chico Buarque de Hollanda and two other singers, Ana de Hollanda, Minister of Culture under the chairmanship Dilme Roussef, and Cristina Buarque.
She is the mother of singer Bebel Gilberto, whom she had with João Gilberto, one of the bossa nova's style parents.