Trío Calaveras (also El Trio Calaveras and Trio Los Calaveras. The Trío Calaveras are an acoustic Mexican guitar and vocal trio, notable for their performances and recordings with pop singer Jorge Negrete. Their name means "Skulls Trio"; in Mexico "calavera" also means a cool casanova. The original members of the trio in the 1930s were Raúl Prado, Miguel Bermejo and Pepe Saldivar.