This is where you need to start, whether loading from chapter select or just playing though.
This will not work if you have already completed the waltz in this playthrough.

Do the following:

• Start the waltz.
  
• Fail the waltz.

• Step into the now open cage and quickly grab the spoon in the black cove and leave before it locks you in.
  (If you fail to grab the spoon you can just fail the waltz again)
  
• Return the spoon to the display outside of the door you just came from.

Once you have replaced the 2nd Spoon, walk back down to the two father's offices.

Do the following:

• Go into Dr. Z. W. Francis' office.

• Grab the spoon on the shelf behind the door.
  
• Head through the hallways of four doors behind you.
  
• Return the spoon to the display on your right.

Once you have replaced the 1st Spoon, walk back up to the waltz room.

Do the following:

• Complete the waltz.
  
• Make your way through the game until you are asked to remove your clothes.

• Open the cupboards and pick up the spoon.
  
• Return the spoon to the display near your last sacrifice.