This started off really interesting, but I found eventually that describing things from shows was not as sustainable as it could have been. The book chronicles Prince's career up until 1974, so I think a more complete compilation of things would be good. There was also very little personal detail about his life. While I appreciate this to some extent, I think an elemental of intimacy could have helped diversify the contents.
That said, Harold Prince is a brilliant man and if there was a second part to the biography I would certainly read it.