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This mechanism plays the tune City of stars (Justin Hurwitz). You can include this mechanism in any of the following music boxes.

The mechanism will sound when it's winded up and you open the box. It works like a mechanical clock: you have to turn a key (wind it up), and then the mechanism will sound automatically when you open the box until it runs out or the music box is closed. It lasts around 4 minutes sounding in a 40 seconds loops.