What do I have to play to open the crypt door?

Hi Catmhill!

SPOILER for the Monastery (how to play the Glockenspiel):

You need to find the correct melody in a certain book which you can find after you get inside the library. IF you haven't found it yet, try to see if you could find a secret door somewhere in the library, and you'll find it at the far side of any possible secret rooms... ;)

You also need to talk to the bird hiding in the Glockenspiel, and get her to move out before the Glockenspiel will work.