- Noreen Berry, Forbes Robinson, Raymond Nilsson, Michael Langdon, Otakar Kraus, John Lanigan, Rafael Kubelík, Ramón Vinay, Gré Brouwenstijn, Marian Nowakowski, Orchestra of the Royal Opera House
- Victorio Bacciato, Gré Brouwenstijn, Mario Verazzi, Richard Tucker, Chorus of Teatro Colon, Norman Scott, Ruzena Horakova, Orchestra of the Teatro Cólon, Virgilio Tavini, Mignon Dunn, Aldo Protti, Guerrino Boschetti, Fernando Previtali, Giulio Viamonte