Quatro Copos formed in the early 1970s in Rio de Janeiro with four members: Paulinho, Morcegao, Leandro, and Sergio. Their debut album came out in 1975, and the song "Por Que Sou Seu Amigo?" became particularly well-known.
Their music mixed Brazilian rhythms with rock and other styles, and the lineup stayed mostly the same for years, with Paulinho handling lead vocals.
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