Orchestra and Choirs of the Metropolitan Opera House/Gaetano Merola/Italo Montemezzi/Hans Hermann Nissen/Lotte Lehmann/Charles Kullman/Heinrich Schorr/Irene Jessner/Walter Olitzki/Emanuel List/Karl Laufkötter/Karen Branzell/Herbert Janssen/Max Altglass/Louis D'Angelo/Giovanni Paltrinieri/Ludovico Oliviero/George Chehanovsky/John Gurney/James Wolfe/San Francisco Opera House/Vienna Philharmonic/Erich Leinsdorf/Bruno Walter/Arturo Toscanini/Cesare Sodero/Sir Thomas Beecham