The nagak (also called na, sora, or godong) is a large seashell played as a horn in Korean traditional music. It produces only a single tone and is used primarily in the military procession music called daechwita. The nagak has a structure that makes a mouthpiece by making a hole in the pointed end and blows out a sound. The shell is that of a very large sea snail, Charonia tritonis, sometimes known as "Triton's trumpet". This shell is also used as a musical instrument in several other nations. See also Conch (musical instrument) Horagai, a similar shell horn used in Japan Music of Korea Shankha Traditional Korean musical instruments References External links 나각 at Korean National Heritage Online Korean musical instruments Natural horns and trumpets