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