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double-reed Chinese wind instrument, having a cylindrical body with seven frontal finger holes and one thumb hole. The northern version is made of wood, and the southern of bamboo. The instrument's range is about two and one-half octaves. The length of the guan varies from 7 to about 13 inches (18 to 33 cm). The houguan of southern China is a larger version. Some modern guan have a loosely attached, flaring bell at the end of the instrument