To activate the song, we need to find Four plates around the map.

First location: Forecastle. Go to the right staircase and on the middle landing, you will see a file of boxes or barrels. In the middle of that there’s a shinning plate then, shoot it.

Second location: Lower Grand Staircase. This is located on pack machine on that, you have to look on the ceiling.

Third Location: Sun Deck. This plate is found on the life boat.

Fourth Location: Poop Deck. Go straight to pack machine location then. on your left side corner next to staircase. Plate is in the middle.