Fidelio is the only opera that Beethoven ever wrote. Originally entitled Leonore, oder Der Triumph der ehelichen Liebe, with the libretto prepared by Joseph Sonnleithner from the French of Jean-Nicolas Bouilly, it premiered at the Theater an der Wien on 20 November 1805. The following year Beethoven’s friend Stephan von Breuning rewrote the libretto to create a second version that shortened the opera from three acts to two. In 1814 Beethoven revised his opera yet again,...