Guzheng (zheng 箏, gu 古 means "ancient"), is a Chinese plucked zither.  It has 16 or more strings and movable bridges, and the modern guzheng usually has 21 strings and bridges.
The guzheng is the ancestor of several other Asian types of zither instruments. Its descendants spread all over Asia, such as the Koto in Japan, the Kayagum in Korea and the Dan Tranh in Vietnam.

For more information on this fascination instrument vist:

https://guzhengalive.com/guzheng-history

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