The Blue Angel
Der blaue Engel (original)
An elderly professor's ordered life spins dangerously out of control when he falls for a nightclub singer.
Starring Emil Jannings, Marlene Dietrich, Kurt Gerron, Rosa Valetti, Hans Albers, Reinhold Bernt, Károly Huszár, Eduard von Winterstein, Hans Roth, Rolf Müller
It's a drama and music movie, and has a rating of 7.7 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Finland.