Fidelio by Ferdinando Paer (a score of which was owned by Beethoven). Beethoven published the 1806 libretto and, in 1810, a vocal score under the title "Leonore", and the current convention is to use the name "Leonore" for both the 1805 (three-act) and 1806 (two-act) versions and "Fidelio" only for the final 1814 revision. The first version with a three-act German libretto adapted by Joseph Sonnleithner from the French of Jean-Nicolas Bouilly premiered at the Theater an der Wien on 20 November 1805, with additional performances the following two nights. The success of these performances was hindered by the fact that
The Secret (opera) The Secret (opera) The Secret () is a comic opera in three acts by Bedřich Smetana. The libretto was written by Eliška Krásnohorská. The premiere took place on 18 September 1878 at the Nové České Divadlo (New Czech Theatre) in Prague. Krásnohorská proposed the idea for a new opera to Smetana two weeks after the opening of "The Kiss", but kept details of the plot a secret from the composer until July 1877, when a draft outline, drawing on several sources, including "Les femmes et le secret" by La Fontaine, was sent to him. The librettist had set the action