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This song, performed by Gal Costa, was recorded live in 1972. According to AllMusic.com, she was one of the preeminent singers of the Tropicalia movement. One of her songs was included on the iconic "Tropicália: Ou Panis Et Circenses" compilation, perhaps the best introduction to Tropicalia. According to Wikipedia, she, like Caetano Veloso et al., was active in Brazilian politics and resisted Brazil's 1968 ban on dissent in music.