Kantan in the Later Han described the importance of Kin in "Shinron" (literally, 'new theory') and so did Osho (a person in Houhan in China) in "Fuzokutsu" (a book about public morals).
後漢の桓譚は『新論』で、応劭は『風俗通』にてそれぞれ琴の重要性を説いている。