This still showed up on a Facebook group and everyone's first guess was "Metropolis", but, of course, it isn't.
Turns out, it's from a 1934 backstage musical, "Evergreen".
This number somehow represents the 1934 idea of what people in 1914 thought the future would be like.
Vacuform Spanx!
Skip to 42:38 if this clip doesn't do that automatically.
https://www.youtube.com/v/03I8hWhsO1k?t=42m38s