Music box, mechanical musical instrument that is sounded when tuned metal prongs, or teeth, mounted in a line on a flat comb are made to vibrate by contact with a revolving cylinder or disc that is driven by a clockwork mechanism. As the cylinder or disc revolves, small pins or other projections
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Youtang 18 Note Windup Musical Mechanism DIY Music Box Movement,Tune:Ode to Joy : Home & Kitchen