This entry in the Internet Archive Top 100 is a little unusual. Both IMDb voters and Leonard Maltin give this film ratings that should push it much higher on the list, but those are for the original German-language version, not this English version that was made simultaneously.

The Blue Angel presents the tragic transformation of a respectable professor to a cabaret clown and his descent into madness. It was the first feature-length German full-talkie, and it brought international fame to Marlene Dietrich as the woman who lures the professor away from his high school. Even when struggling with English, they’re all good at going bad.