In The Phantom of the Opera, the term "Music Box" refers to a small, decorative box that plays music when it is wound up. It usually contains a mechanism that produces sound using a set of metal pins or a rotating cylinder. Music boxes are often used as a symbol in the story to represent the enchanting and mysterious nature of the Phantom's presence. They are also associated with nostalgia and the beauty of classical music.
If you have any more questions or if there's anything else you'd like to know, feel free to ask