Two Girls and a Sailor is a 1944 musical film about two singing sisters who are helped to set up a canteen to entertain soldiers by a mysterious wealthy admirer. It featured a host of celebrity performances, including Jimmy Durante, Harry James, Gracie Allen, and Lena Horne. Richard Connell and Gladys Lehman. The mysterious millionaire turns out to be Van Johnson.
And has one of my favourite songs of the era -
And this fantastic Ritual Fire Dance (by Manuel de Falla) piano duet -