Tongqin is also known as "mang tube", "copper winter", "copper hole", "big copper horn" and so on. "Tongqin" in Tibetan means a large size. The Mongolian people call it "Bili", and the Chinese call it a large tube, a long horn, and a small copper horn. It is a very important bass instrument in Lamaist bands. This musical instrument has a history of at least 700 years in Tibetan areas. It was fi...