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In 1945 he signed a contract with the Metropolitan Opera, making his debut at the house on 18 February 1946 as Colline in La bohème with Dorothy Kirsten as Mimì, Jan Peerce as Rodolfo, Frances Greer as Musetta, John Brownlee as Marcello, and Cesare Sodero conducting.
Kahn accompanied some of the great musicians of the day, including violinists Mischa Elman and Fritz Kreisler; sopranos Dame Nellie Melba, Luisa Tetrazzini, Florence Austral and Oda Slobodskaya, tenors Enrico Caruso, John McCormack, Richard Tauber, Joseph Hislop and Beniamino Gigli; and baritones Titta Ruffo and John Brownlee.