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 orders, Rocco has been giving the imprisoned Florestan diminishing rations until he is nearly starved to death. Jaquino and Marzelline are alone in Rocco's house. Jaquino asks Marzelline when she will agree to marry him, but she says that she will never marry him now that she has fallen in love with Fidelio, unaware that Fidelio is actually Leonore in disguise ("Jetzt, Schätzchen, jetzt sind wir allein"—"Now, darling, now we are alone"). Jaquino leaves, and Marzelline expresses her desire to become Fidelio's wife ("O wär ich schon mit dir vereint"—"If only I were already united with thee"). Rocco enters, looking