3.) why did burt williams get to the theatre during the strike and it was dark?

Actors Equity declared a strike against New York stage immediately darkening pretty much every theater in town. Bert Williams reported for work that night anyway.In New York, Williams had never been invited to join Actors Equity."But I have often found it inconvenient in America.

pitch- the definition of pitch is as follows:

"the quality of a sound governed by the rate of vibrations producing it; the degree of highness or lowness of a tone."