Fidelio Fidelio Fidelio (originally titled ; English: "Leonore, or The Triumph of Marital Love"), Op. 72, is Ludwig van Beethoven's only opera. The German libretto was originally prepared by Joseph Sonnleithner from the French of Jean-Nicolas Bouilly, with the work premiering at Vienna's Theater an der Wien on 20 November 1805. The following year, helped shorten the work from three acts to two. After further work on the libretto by Georg Friedrich Treitschke, a final version was performed at the Kärntnertortheater on 23 May 1814. By convention, both of the first two versions are referred to as "Leonore". The libretto, with
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