I am beyond tickled to learn this was put together using google docs. Great work.

I’m duplicating some of what’s been said already, but your maps are really distinctive. Makes your work stand out.

And yay opera! We need more opera and music venues in rpgs.

The hallucinations are nice atmosphere. Kind of reminds me of that video game Eternal Darkness.

Nice breakdown of rooms/keys. I love that. I feel like our adventures could be paired in an  urban anthology series. Thanks for submitting!

I wish more opera houses could slip into ttrpg's, you have that classy horror grim vibe so fresh, so cool.

Love the hand-drawn maps

The hallucinations table is fun; your map fragments are helpful (great cross-hatching)! 

I wondered if a trap door encounter leads to the underground (area 6) or only the trap door in Room C. I'm sure I could run it in whatever way seemed fun!

I love that you included the singing voices of the ghosts. I personally like the freeflowoing layout, but some see it as a bit... loose?

Anyway great job! 

Great theme! The bulleted lists for the areas make them evocative and easy to run and I like how they all come with little hand drawn depictions. Also several fun (music-themed) monsters to play with.