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
Fidelio a grave for him in the floor of the dungeon. Once the grave is ready, Rocco is to sound the alarm, upon which Pizarro will come into the dungeon and kill Florestan. Fidelio, hearing Pizarro's plot, is agitated, but hopes to rescue Florestan ("Abscheulicher! Wo eilst du hin?" and" Komm, Hoffnung, lass den letzten Stern"—"Monster! Where are you off to so fast?" and "Come, hope, let the last star"). Jaquino once again begs Marzelline to marry him, but she continues to refuse. Fidelio, hoping to discover Florestan, asks Rocco to let the poor prisoners roam in the garden and enjoy