Morgan stars in this Technicolor Warner Bros. musical biopic of tenor Chauncey Olcott. The Irish immigrant went from tugboat skipper to minstrel shows and composer of sentimental ballads, including "When Irish Eyes Are Smiling," "Mother Machree," and the title tune. Famed vaudeville star Lillian Russell (King) gives Olcott his big break, which causes jealousy in his relationship with true love Rose (Dahl).