I found the questions at the end of Lecture 1 interesting.
In Pondering the difference between Broadway musicals and early Hollywood musicals it seems that once sound was introduced and Hollywood starting releasing musicals many other forms of stage music theater were lost (i.e. Vaudeville and Minstrel shows) They either had to adapt to the "new" kid, or perish. (We know the outcome) But living in that time had to be a bit scary for Vaudevillians. Especially those who thought this film thingy will never fly.
I also wonder how many local theater owners were not in a financial positio