Here's a brief explanation of the science, history, and mechanics involved in a music box. While some of this seems obvious to those of us who took apart music boxes as kids (ahem), there's a whole segment at the end of this video about a historical music box using large LP-style platters called a Polyphon. It's beautiful, educational, and fun. Gather the kids 'round and learn from the folks at The Curiosity Show!
You can read more about The Curiosity Show at The Kid Should See This.
(Via The Kid Should See This.)