The oldest Korean historical records about an hourglass-shaped drum may be traced to the reign of King Munjong (1047–1084) of Goryeo as a field instrument.
Janggu |
Originally, Samhyeon designated three chordophones, Geomungo, Gayageum, and Hyangbipa and Nyukgak designated Buk, Janggu, Haegeum, and Piri at the Unified Shilla period from 654 to 780.