[1] He then worked as a conductor at the Metropolitan Opera in New York City where he conducted nearly 250 performances from 1903 to 1907.
[2] At the Met, he notably conducted the United States premieres of Umberto Giordano's Fedora and Hector Berlioz's La damnation de Faust in 1906.
He also conducted the Met's first performances of Donizetti's L'elisir d'amore and Lucrezia Borgia in 1904, and the Met's first performances of Manon Lescaut and Madama Butterfly in 1907, both of them supervised by Puccini.
He also led performances of new productions of Verdi's Aida, Donizetti's Don Pasquale, Ponchielli's La Gioconda, Bellini's La sonnambula, Meyerbeer's L'Africaine, Verdi's Rigoletto at the Met.
He also conducted operas in Bergamo, Berlin, Dresden, Madrid, Prague, and Trieste during his career.