The sound of the koto, a thirteen stringed zither or harp, is to many people the sound of Japan. Japan’s most popular traditional musical instrument, it is widely played even today. Two meters in length, it is made of hollowed-out paulownia wood. First brought to Japan from China in the eleventh century, the koto has retained its refined and elegant sound down through the centuries.
There are many Japanese restaurants such as soba restaurants and sushi restaurants that play Koto music in the background. If you live in Japan, you will surely hear the music of this Koto, so you should remember it.
https://www.youtube.com/watch?v=L24Nb4CJzV4 (Koto video play)