It's disgusting that a Broadway show can't try out anymore, that no matter where they are in the world, there is this massive dialogue going on between people damning or praising it.
These tapes have been found, which were taken from the desk and various bootlegs. At the time we never got to hear them, they didn't seem to be available or they just got put to one side.
That's why modern corporate movie making has become so laborious that comedians are kind of kicked out by 50.

