Walter Olitzki

Orchestra and Choirs of the Metropolitan Opera House, San Francisco Opera House, Vienna Philharmonic, Erich Leinsdorf, Bruno Walter, Arturo Toscanini, Cesare Sodero, Sir Thomas Beecham, Gaetano Merola, Italo Montemezzi, Hans Hermann Nissen, Lotte Lehmann, Charles Kullman, Heinrich Schorr, Irene Jess

Irene Jessner, Emanuel List, Jarmila Novotná, Walter Olitzki, Nadine Conner, Thelma Votipka, Alessio De Paolis, Hertha Glaz, Lorenzo Alvary, Emery Darcy, Anthony Marlowe, Gerhard Pechner, Lodovico Oliviero, Thomas Hayward, Maxine Stellman, Mona Paulee, Thelma Altman, Lillian Raimondi, Edward Caton,