Changgo: Korean double-headed hourglass drum

Changgo or changgu is a double-headed drum with a body shaped like an hourglass.  It is used to accompany almost all genre of Korean music from court music to shaman ceremonies. Its body is usually made of paulownia wood, although there some may be made of ceramics, metal, as well as pottery.  Its heads are made of animal skin; the left head is made of cowhide or deer hide, which produces a low tone; and the right head has a thinner skin and is made from either doghide or horsehide, and usually produces a higher tone.  Both heads are held together with rope cords that crosses between them and can be adjusted for tuning.

To use the changgo, a bamboo stick called ch'ae strikes the right side of the drum making a tak sound and the palm of the left hand strikes the left head making a kung sound.