The nagak (Korean: 나각; also called na, sora, or godong)[1] is a wind-instrument made from a large seashell and 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 mouthpiece of the nagak is made by making a hole in the pointed end of the conch,[2] into which a mouthpiece is fitted.

[3] As the instrument is from organic animals, it can vary in size.

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