Korean traditional drum
The janggu (Korean: 장구, also transliterated as janggo or changgo) or seyogo (세요고; 細腰鼓; lit. slim waist drum) is a drum often used in traditional Korean music.[1][2] It consists of an hourglass-shaped body with two heads made from various types of leather.[2] The two heads produce sounds of different pitch and timbre, which when played together are believed to represent the harmonious joining of Um and Yang.[3] The janggu is one of the four components of samul nori (사물놀이), alongside the buk (북), jing (징) and kkwaenggwari (꽹과리).