Gianni Schicchi included the aria set to a libretto by whom?
Gianni Schicchi:  The aria "O mio babbino caro" is one of Puccini's best known, and one of the most popular arias in opera. O mio babbino caro: "O mio babbino caro " ("Oh My Beloved Father") is a soprano aria from the opera "Gianni Schicchi" (1918) by Giacomo Puccini to a libretto by Giovacchino Forzano.
Giovacchino Forzano