A comic opera composed in 1917–18 contains an aria sung by who? 
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:  It is sung by Lauretta after tensions between her father Schicchi and the family of Rinuccio, the boy she loves, have reached a breaking point that threatens to separate her from Rinuccio.
i don't know