Love is born between Anna, daughter of Alfonso, a wealthy farmer, and Luigi, a drum player in a musical band, who live in two different villages-Square on the Piano and Casalieta. This feeling is thwarted by her father, who would like to give her in marriage to Nicolino, a law student and son of a landowner, who has seen the girl only once and was struck by her beauty. Ahead of a party, her father prevents Anna from going out into the square where the band is scheduled to perform; the girl then comes up with the idea of delivering a note to Rosetta, the innkeeper's sister and a great friend of hers, finding mediation from Marcellino.
IT