The lusheng (simplified Chinese: 芦笙; traditional Chinese: 蘆笙; pinyin: lú shēng, pronounced [lǔʂə́ŋ]; Vietnamese: Khèn Mông; also spelled lu sheng; spelled ghengx in standard Hmong and qeej in Laotian RPA Hmong) is a Hmong musical instrument. It has a long history of 3000 years in China, traced back to the Tang Dynasty. It is a mouth organ with multiple bamboo pipes, each fitted with a free reed, which are fitted into a long blowing tube made of hardwood. It most often has five or six pipes of different pitches and is thus a polyphonic instrument. Its construction includes six parts (mouthpiece, air feed pipe, sheng dou (笙斗, body), sheng guan (笙管, pipes), reed, and resonator tube). It comes in sizes ranging from very small to several meters in length.