What film that Bill Tytla worked on came out in 1937?
Bill Tytla:  Tytla is particularly noted for the animation of Grumpy in "Snow White and the Seven Dwarfs", Stromboli in "Pinocchio", Chernabog in the "Night on Bald Mountain" sequence from "Fantasia" and the title character in "Dumbo". Snow White and the Seven Dwarfs (1937 film): Snow White and the Seven Dwarfs is a 1937 American animated musical fantasy film produced by Walt Disney Productions and originally released by RKO Radio Pictures.
Snow White and the Seven Dwarfs