The gayageum or kayagum is a traditional Korean zither-like string instrument, with 12 strings, though some more recent variants have 21 or other number of strings. It is probably the best known traditional Korean musical instrument. It is related to other Asian instruments, including the Chinese guzheng, the Japanese koto, the Mongolian yatga, and the Vietnamese đàn tranh. When played, the sound varies between traditional Eurasian stringed instruments and the Appalachian banjo.
Here, Luna Lee, at the 21-string (I think) gayageum, performs a classic folk song from the faraway land of Tejas: