Type: Aerophones > Flutes > Notched.
Hornbostel-Sachs No#: 421.111.12
Region: Far East Asia.
Description: An end blown notched flute from Korea that is about 65 cm in length. It has six finger holes. The first of which, being the thumb hole is located on the back of the instrument. The treatise Akhak Kwebom  specifies a cross-shape opening for the chok a plug, similar approach in construction to a transverse flute.
Musical instruments with the name “chock”appeared in a large bequest of instruments for ritual music [aak] from the Song Era Chinese Emperor in 1116. The Akhak Kwebom  indicates the chock was still used only in ritual music in the 15th century. This remains in practice even today.
Citations: Bibliography: Stanley Sadie ~ New Grove Dictionary Of Music ~ Page 361, 362 ; Volume 1 Book A to F ; Song Hyun, ed. Akhak Kwebom [Guide to the study of music], Seoul 1943 / R1975] 6.17a ; Chang Sa-Hun: Han’guk akki Taegwan [Korean Musical Instruments] Seoul, 1969], 311 Robert C. Provine ;