[mod50ack]

Didn't nail the Rodgers and Hammerstein one; it still doesn't understand the reference to the ballet or that the "themes" in the question are musical.

[bombcar]

I wouldn’t be surprised if half the Internet does not know that a ballet is part of a larger show.

[gomox]

Half??

[bombcar]

O.K., less than half know that the ballet is scheduled at appropriate times so the friends of the girls can get some bar time in without undue hassle.