Forget her string of Brodawy successes. Forget even the flowers-and-candlelight ardor of handsome bachelors. There's only one great passion in Grace Moore's life: to star at New York's Metropolitan Opera House.Flowing with songs popularized by Moore and excerpts from three classic operas, So This Is Love is a polished gem about how the stage and screen star (a Best Actress Oscar nominee for 1934's One Night of Love) sang her dream into reality. It's a perfect match of star and role: Kathryn Grayson (Show Boat, Kiss Me Kate), who also had an enduring ambition to perform on the operatic stage, portrays Moore. A colorful supporting cast plays the Who's Who roles of other show-biz greats, and in only his second movie is an entertainer who'd score big on the home screen: Merv Griffin.