Archaeological digs have uncovered globular clay vessel flutes (xun), tuned stone chimes (qing), and bronze bells (zhong), and the word gu, for drum, is found incised on Shang oracle bones (turtle shells and ox bones used by rulers for ritual divination and sacrifice to obtain the grace of their ancestors). Musical instruments were traditionally classified into eight categories known as bayin. Bamboo pipes and qin are among the oldest known musical instruments from China. Traditional Japanese musical instruments, known as wagakki (和楽器) in Japanese, are musical instruments used in the traditional folk music of Japan. They comprise a range of string, wind, and percussion instruments. Traditional Japanese musical instruments, known as wagakki (和楽器) in Japanese, are musical instruments used in the traditional folk music of Japan. They comprise a range of string, wind, and percussion instruments.