Question: Léontine de Maësen (15 July 1835 – 1906) was a Belgian coloratura soprano active on the opera stages of France from 1858 to 1868, most remembered today for having created the role of Leïla in Bizet's 1863 opera in three acts, titled what?
Sentence (from "Rita Fornia"): Early on in her career her voice darkened and dropped slightly causing her to focus more within the mezzo-soprano repertoire while still singing some soprano roles.
Relevant evidence: No