A Jew's Harp is a small piece of metal that fits in your mouth
to make many different sounds and noises, where as a normal harp
can be a very large string instrument.
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It's a corruption of jaw harp, which is what some people still
call it.
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A Jew's Harp (or mouth harp) doesn't have any strings. It is
metal, played with the hand and controlled by the mouth.
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Mouth harp, also known as a jew's harp. One of the oldest known
instruments.