 His other important "firsts" at the Met include the US premieres of Mozart's "Così fan tutte", Smetana's "The Bartered Bride", Borodin's "Prince Igor" (singing both Prince Galitzky and Khan Konchak), and Montemezzi's "L'amore dei tre re".He also sang under the baton of Gustav Mahler in Mozart's "Le nozze de Figaro", Smetana's "The Bartered Bride" and the Met premiere of Tchaikovsky's "The Queen of Spades".Didur's last appearance at the Met was in the role of Coppélius in "Les Contes d'Hoffmann" on 11 February 1932.