Mario Verazzi, Virgilio Tavini, Guerrino Boschetti, Chorus of the Teatro Colón, Orchestra of the Teatro Cólon, Fernando Previtali, Gre Brouwenstijn, Aldo Protti, Richard Tucker, Mignon Dunn, Norman Scott, Giulio Viamonte, Ruzena Horakova & Victorio Bacciato