Gold Mine in the Sky (1938)
Gold Mine in the Sky is a 1938 Western film directed by Joseph Kane and starring Gene Autry, Smiley Burnette, and Carol Hughes. Based on a story by Betty Burbridge, the film is about a singing cowboy and ranch foreman who, as executor of the owner's will, must see that the daughter and heiress does not marry without his approval.
More at Wikipedia.