Slezak's international career commenced in London at the Royal Opera House, Covent Garden, where he sang Siegfried (a punishing role that he would soon drop from his repertoire) and Lohengrin in 1900. (He would return to Covent Garden in 1909 after undertaking further vocal studies in Paris the previous year with a great tenor of a previous era, Jean de Reszke.)
\nSlezak secured a three-year contract with the New York Metropolitan Opera in 1909. Met audiences acclaimed him in performances of works by Wagner and Verdi. Along with Italy's Giovanni Zenatello, he became the most famous Otello of his generation, famously performing the role at the Met with Arturo Toscanini conducting.
\nHe was a convivial person, and many anecdotes reveal his amiable sense of humour. The best-known example is as follows: during a performance of Wagner's Lohengrin, a stage hand sent the swan out too early, before the tenor could hop aboard. Seeing his feathered transportation disappear into the wings, Slezak ad-libbed to the audience: "Wann f\xe4hrt der n\xe4chste Schwan?" ("When does the next swan leave?").
\nSlezak had a versatile repertory which embraced 66 roles. They included notably Rossini's Guillaume Tell, Manrico, Radames, Walter, Tannh\xe4user, Hermann and, as we have seen, Otello and Lohengrin. He sang 44 roles in Vienna alone, where he chalked up 936 appearances in 1901-12 and 1917\u201327 and became an idol of audiences.
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\nDame Blanche,Euryanthe,Queen of Sheba