Edivaldo Pereira Alves (São Paulo, September 20, 1970) known by his pseudonyms Edi Rock or Cocão is a Brazilian singer and songwriter. He is a member of the famous group Racionais MC's. He started his career with his friend KL Jay and in 1988 he met Mano Brown and Ice Blue. The songs are his own, A Vida é Desafio, Em Qual Mentira Vou Acreditar, Mágico de Oz
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