NABAL: Korean musical instrument
https://worldhitz4u.blogspot.com/2014/10/nabal-korean-musical-instrument.html
The nabal is a
long, straight brass horn that is used in the traditional
music of Korea. As the musical instrument has no valves or finger holes, the
musical instrument is not a melodic instrument but instead, it plays a single
unremitting tone. The exact frequency of the tone that is manufactured can be
quite dissimilar reliant on the size of the individual musical instrument.
The musical instrument has historically
been used mainly in the military procession music known as daechwita, and also in nongak, to signal the starting and ending of
performances.