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.[1] This instrument is first recorded as being used in Goryeo.[3]
As the instrument is from organic animals, it can vary in size. The shells were sometimes decorated with cloth or paint.[3]
