1. Komunko (Also called Hyonkum) A long zither, this instrument is said to have been invented by Wang San-ak, a musician of the Koguryo period. It has six strings made of twisted silk threads. The second, third and fourth strings are stretched over 16 bridges. The top side of the instrument is made of paulownia and the bottom side, chestnut wood. A player, with a small bamboo rod, strikes or plucks the strings just above the band of leather glued across one end of the soundboard. Komunko is used for a solo performance or in a concert. It is also played to accompany a Korean classical lyric.