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in music, transverse (or side-blown) bamboo flute of the Han Chinese. Traditional di have a membrane of bamboo or reed tissue covering the hole that is located between the mouth hole and the six finger holes. This membrane creates a distinctive sound characteristic of much Chinese flute music. An additional two or more end holes aid in the expulsion of air and are sometimes used to attach decorative silk tassles. Di have a two-octave range, and complete modern sets can be purchased in Western tunings. There are many varieties of traditional lengths and construction