It used to be, back in the days of fanzines and mailing lists, that this was the bible of the Phantom of the Opera. This was the book that people turned to as a reference for many types of Phantom adaptations.

But now we have the internet and forums and chat rooms, where we can glean all of the information that this book contains and more. It doesn't help that the information in this book is very dated, and some of it is just plain wrong. ( )