His "Rigoletto" contains the aria "La Donna e Mobile"
The Duke of Mantua sings this 
unforgettable aria in the third act of Verdi's Rigoletto as he flirts with Maddalena, 
the sister of the ... Rigoletto, the Duke's right hand man, and his daughter, Gilda, 
who has fallen in love with the Duke, pay a visit to Sparafucile.