Orchestra of the Metropolitan Opera House, Erich Leinsdorf, Charles Kullman, Friedrich Schorr, Walter Olitzki, Herbert Janssen, Emanuel List, Max Altglass, Louis D'Angelo, George Chehanovsky, Nicholas Massue, Ludovico Oliviero, Giovanni Paltrinieri, James Wolfe & John Gurney

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