The role of Rosina was originally written for a contralto. According to music critic Richard Osborne, writing in "The New Grove Dictionary of Opera", "it is important to record the degree to which singers have sometimes distorted Rossini's intentions. The most serious distortion has been the upward transposition of the role of Rosina, turning her from a lustrous alto into a pert soprano." However, it has also been noted that Rossini, who frequently altered his music for specific singers, wrote a new aria for the second act for Joséphine Fodor-Mainvielle, a soprano who had sung Rosina in the 1818 London premiere, and sang the new aria c. 1820 at the Théâtre-Italien in Paris, where it was published.