Cheered on this stage last winter as the lovers in Verdi’s La Traviata, two rising stars return for a tuneful potpourri of highlights ranging from Mozart to verismo. Among the duets most likely to set the house on fire: the bedroom scene from Gounod’s Roméo et Juliette, and Rodolfo and Mimí’s first encounter from Puccini’s La Bohème, under the wintry Paris moon. —M.G.