A Song of Kentucky (1929)

Jerry, a young song writer, falls in love with Lee Coleman, a wealthy Southern girl. She is being forced into marriage with a fortune hunter who upon learning of her infatuation pays a former vaudeville partner of Jerry's to frame him. Stunned by what she believes to be the truth, Lee goes back to Kentucky and there she makes a wager with her would-be fiance that if her horse does not win the Derby she will marry him. She loses her wager and on the eve of her wedding she slips away to attend a concert where Jerry directs his own symphony. At the close of the concert the girl who had caused the trouble confesses and so Lee and Jerry are happy.