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In page Gal Costa:

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At the age of 10, Gal befriended sisters Sandra and Andréia Gadelha, the future spouses of singer-songwriters Gilberto Gil and Caetano Veloso, respectively. They gave her the nickname Gau, later spelled as Gal.[5] At 14, she first listened to João Gilberto's "Chega de Saudade" on the radio and became interested in Bossa Nova.[citation needed] She then went on to work as a clerk in Salvador's main record store to get closer to music.[6] At 18, she was introduced to Caetano Veloso by Andréia Gadelha, becoming close friends.[4]