Common modern danso, made of varnished bamboo
The danso (also spelled tanso) is a Korean notched, end-blown vertical bamboo flute used in Korean folk music. It is traditionally made of bamboo, but since the 20th century it has also been made of plastic. It is imported from china in 19th century, where it is called duanxiao simplified Chinese: ; traditional Chinese: ; pinyin: ; literally: "short xiao". The Korean name is just the transliteration of the chinese one, a short variant of the xiao.
The flute has four finger holes and one thumb hole at the back. The playing range is two octaves, going from low G to high G. The lower sounds are made by just blowing, whereas the higher ones are made by difference in the strength of the blowing.
The dan in the instrument's name means "short," and so refers to the notched, end-blown vertical bamboo flute. Another Korean end-blown vertical bamboo flute, the tungso (Hangul: ; Hanja: ??), is longer.