Wikipedia
The taepyeongso (lit. "big peace wind instrument"; also called hojok, hojeok 호적 胡笛, nallari, or saenap, 嗩吶) is a Korean double reed wind instrument in the shawm or oboe family, probably descended from the Persian zurna and closely related to the Chinese suona. It has a conical wooden body made from yuja (citron), daechu ( jujube), or yellow mulberry wood, with a metal mouthpiece and cup-shaped metal bell. It came to Korea from China during the Goryeo period (918 – 1392).
The loud and piercing sound it produces has kept it confined mostly to Korean folk music (especially " farmer's band music") and to marching bands, the latter performed for royalty in the genre known as daechwita. It is, however, also used sparingly in other genres, including Confucian, Buddhist and Shamanist ritual musics and neo-traditional/fusion music.