Fidelio is a German opera with spoken dialogue by Ludwig van Beethoven, his only opera. The German libretto was originally prepared by Joseph Sonnleithner from the French of Jean-Nicolas Bouilly and the work premiered in Vienna on November 20, 1805.
The opera tells how Leonore, disguised as a prison guard named "Fidelio", rescues her husband Florestan from death in a political prison. This live 1961 recording stars the late Jon Vickers. Otto Klemperer conducts.