Sun Valley Serenade

Sun Valley Serenade is a 1941 musical that takes place over the Christmas holidays. It stars Sonja Henie, John Payne, Glenn Miller, Milton Berle, and Lynn Bari and features the Glenn Miller orchestra. Songs include Chattanooga Choo Choo, Moonlight Serenade, and In the Mood. It got 3 Academy Award nominations. Great fun! Of course, I say that trusting you'll be able to put up with sexist fluff. It is a 1941 musical comedy, after all.

via Youtube:

Time Out says to watch it not for the plot but for "the band playing 'Chattanooga Choo-Choo' ... 'In the Mood' and other evergreens, and a marvellous bit of Hermes Pan choreography performed by skater Henie on black ice." TCM has an overview and offers this synopsis: "A Norwegian war orphan adopted by a pianist as a publicity stunt turns out to be a beautiful young woman". Rotten Tomatoes has an audience rating of 83%.