A music box is a small mechanical device that plays music when a lid is opened or a key is turned. Inside, it contains a metal cylinder with pins that pluck the teeth of a metal comb, producing musical notes. Music boxes can vary in size and design, often featuring intricate carvings or decorative elements. These charming items have been popular since the 18th century and are often used as gifts or collectibles. Some music boxes play well-known tunes, while others may feature original compositions. They are also associated with nostalgia and are sometimes passed down through generations as family heirlooms.