"La donna è mobile" (The woman is fickle) is the Duke of Mantua's canzone from the beginning of act 3 of Giuseppe Verdi's opera Rigoletto (1851).
The canzone is famous as a showcase for tenors. Raffaele Mirate's performance of the bravura aria at the opera's 1851 premiere was hailed as the highlight of the evening.

Before the opera's first public performance (in Venice), the song was rehearsed under tight secrecy: a necessary precaution, as "La donna è mobile" proved to be incredibly catchy, and soon after the song's first public performance, every gondolier in Venice was sing... » ... sing it!