The three little girls singing "In the Highways" at the political rally are a nod to the Carter Family, as the song was written by Mother Maybelle Carter, and was often performed by her daughters (Helen, June and Anita Carter (June later married Johnny Cash) when they were about the same age as the girls in the film. There are recordings online of them singing this song in 1939, and they sound identical to version in the film.

Film

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