Musical Boxes are the Hobby of  Hauke Marxsen 

I've restored many wooden boxes, I purchased on fleemarkets. My wife Mechthild has decorated the boxes with painted porcelain tiles or brooches. Here you see an oak box with a cylinder movement. It's playing a Berlin melodie, when you open the lid. A motive from the Berlin cartoonist "Zille", painted on small tiles, is decorates the underside of the lid.

The heard of a music box is the movement. You can get it in different sizes and quality.  It consist out of a cylinder with pins, a comb, a speed controller and a spring in a barrel to let it run. The most popular movement makers are Reuge in Switzerland, Sankyo in Japan in meanwhile companies in China.

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If you want to know more about mechanical music look at Society for selfplaying Musical Instruments Mechanical Music Digest Musica Mecanica