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