Bella Alten operatic career included six Metropolitan premiere performances – Adele in Die Fledermaus (1905), Gretel in Hänsel und Gretel (1905), Saffi in Der Zigeunerbaron (1906), Olga in Fedora (1906), Columbina in Le Donne Curiose (1912), and Lisetta in L'amore Medico (1914). In November 1905 when she sang Gretel in the premiere Metropolitan performance of Hänsel und Gretel, the composer Engelbert Humperdinck was in the audience. 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 sang Gretel in this opera every season she was with the Met
Louise Alder the Age of Enlightenment in 2017, Atalanta in a new production of Xerxes at Oper Frankfurt also in 2017, and will perform the title role in Theodora at the BBC Proms in 2018 and Romilda (Xerxes) at Oper Frankfurt in January 2019. In December 2018 she will sing Gretel (Hänsel und Gretel) at Bayerische Staatsoper and in March 2019, the title role in La Calisto at Teatro Real, Madrid. Future debuts include Canadian Opera Company, English National Opera and the Royal Opera House. TV appearances have included a performance of Beethoven's Fidelio at the 2017 BBC Proms on BBC 4,