She was singing Cherubino in Le Nozze di Figaro, Nedda in Pagliacci and Eva in Die Meistersinger von Nürnberg under Hans Richter when Heinrich Conried, the Metropolitan Opera's General Manager, heard her at the Covent Garden and engaged her for the Met.
Her New York debut took place in November 1904 as Cherubino in Le Nozze di Figaro in a cast that included Emma Eames, Marcella Sembrich and Antonio Scotti.
[2] She appeared in casts that included famous singers such as Enrico Caruso, Frances Alda, Pol Plançon, Nellie Melba, Emmy Destinn, Ernestine Schumann-Heink, Pasquale Amato, Olive Fremstad, Louise Homer, and Geraldine Farrar, among others.
This opera received 11 performances that first season and was selected by Theodore Roosevelt's wife as a benefit for the Legal Aid Society.
Alten also appeared on Broadway as Maid Marian in Reginald De Koven's Robin Hood with Wallace Hyde and Florence Wickham.