1940. Dance, Girl, Dance. Dorothy Arzner is the first female director on the list. Two dancers with wildly different ambitions work together, but not quite towards mutual benefit. I really liked Maureen O'Hara in this, and Lucille Ball practically runs riot. What a duo!
Before starting on the 40s, bonus movie! 1933, King Kong, special effects by Willis H. O'Brien. The man earned his money and then some. What a spectacle. Weak human drama, as usual. But the viciousness on display suffuses Kong's story with much more pathos than I believe was intended.