One question.
Did Alan Jones and Kitty Carlisle do their own singing?
Schrodinger's cat walks into a bar and doesn't.
Yes for both. Here is Jones, in 2 other productions, singing:
https://www.youtube.com/watch?v=RyHNlfT6B9E
https://www.youtube.com/watch?v=XD1TqO3usP4
And here is Carlisle:
https://www.youtube.com/watch?v=Dvgl5Fv1ae8
https://www.youtube.com/watch?v=Kaepc1YNAS4