It looks like a crank, not a key.
Musician's balcony???? Never heard it called THAT before.
Go down the dumbwaiter from the kitchen. Go up the curving staircase as soon as you get off the dumbwaiter. At the top, go through the door on the right. There's a chest all the way back through that door. That's where the crank is.
-Sazerac
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