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
Hanna-Elisabeth Müller Rolando Villazón in the series "Stars de Demain" by Arte. At the Bavarian State Opera, Munich, Müller was member of the opera studio in the season 2010/11 and member of the company from the season 2012/2013 to 2015/2016. This resulted in a number of successful role debuts, e.g. as Gretel in "Hänsel und Gretel" (March 2013), Zerlina in "Don Giovanni" (May 2013), Susanna in "Le nozze di Figaro" (September 2013), Sophie in "Werther" (October 2015) und Marzelline in "Fidelio" (February 2016). Furthermore she presented roles which she already had performed at other opera houses, i.e. Zdenka in Andreas Dresen's new