High C's (1930)

For Charlie, a doughboy in France, war is another opportunity to sing in a quartet. He falls for local barmaid Antoinette, who likes him too. She encourages him to study, so he does and becomes a sergeant. But his love life and musical career are interrupted by shooting, trench warfare, and his continual run-ins with a cranky lieutenant. A crisis befalls him when the quartet's tenor is shot in the throat: Charlie hears a German soldier singing like an angel, so he hatches an elaborate plan to bring the soldier across no-man's-land. Can Charlie pull it all off, including winning Antoinette's hand?