José Afonso
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Afonso's song "Grândola, Vila Morena" was used as a radio-broadcast signal by the Portuguese Armed Forces during their military coup operation in the morning of 25 April 1974, which led to the Carnation Revolution and the transition to democracy in Portugal. Subsequently, Afonso's music, along with "Grândola, Vila Morena," became emblematic of the revolution, anti-fascism, the Portuguese labor movement, and the political left. Provided by Wikipedia