Types
Shengs can be classified into traditional sheng (传统笙; pinyin: chuántǒng shēng) and keyed sheng (键笙; jiàn shēng). Keyed shengs have only been developed in the 20th century, c. 1950 onwards.
The difference between a traditional and keyed sheng lies in its mechanism. On a traditional sheng, the holes on the finger pipes are pressed directly by the player's fingers. On a keyed sheng, the holes are opened and closed by means of keys or levers. Without keys, the great number of pipes, and the size of the larger instruments makes it impractical for operation by hand.
Read more about this topic: Sheng (instrument)
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