Fidelio some spoken dialogue, tells how Leonore, disguised as a prison guard named "Fidelio", rescues her husband Florestan from death in a political prison. Bouilly's scenario fits Beethoven's aesthetic and political outlook: a story of personal sacrifice, heroism, and eventual triumph. With its underlying struggle for liberty and justice mirroring contemporary political movements in Europe, such topics are typical of Beethoven's "middle period". Notable moments in the opera include the "Prisoners' Chorus" ("O welche Lust"—"O what a joy"), an ode to freedom sung by a chorus of political prisoners, Florestan's vision of Leonore come as an angel to rescue him, and
Washington National Opera order of the day". Four months later, the Society staged a double bill of Gian Carlo Menotti's opera "The Old Maid and the Thief" along with his ballet "The Unicorn, The Gorgon, and the Manticore". It was very successful with both the public and critics alike. Successful presentations followed from November 1957 onwards: "Fidelio"; "Ariadne auf Naxos"; "Idomeneo"; a double bill of Schoenberg's "Erwartung" and Stravinsky's "Le Rossignol" (conducted by the composer); and a December 1961 "The Magic Flute" which resulted in an invitation from President John Kennedy at the White House for some excerpts from the opera. By this