- Vienna Friends of Music Society, Herbert von Karajan, Eugenia Ratti, Oliviero de Fabritiis, Arnold Mill, Cornell MacNeil, Giulietta Simionato, Carlo Bergonzi, Fernando Corena & Renata Tebaldi
- Ettore Bastianini
- Maria Reining, Sena Jurinac, Hilde Gueden, Ludwig Weber, Wiener Philharmoniker & Erich Kleiber
- George London
- Nicolai Ghiaurov