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A musical box is a 19th century automatic musical instrument that produces sounds by the use of a set of pins placed on a revolving cylinder or disc so as to pluck the tuned teeth of a steel comb. They were developed from musical snuff boxes of the 18th century and called carillons à musique. Some of the more complex boxes also have a tiny drum and small bells, in addition to the metal comb. Note that the tone of a musical box is unlike that of any musical instrument (although it is best described as somewhere between the timbres of an mbira).

Source: wikipedia.org
Photo credit: french.pomona.edu