The Five Classics, namely the Book of Songs, the Book of Rites, the Book of Changes and the Spring and Autumn Annals, mean that the Spring and Autumn Annals and the Book of History are historical records and historical materials, while the Book of Songs, the Book of Rites and the Book of Changes are not as famous as historical materials, so they are all historical materials.

There is an explanation for the statement that the piano represents the character of a famous person: watching bamboo and listening to the piano, ancient romantic and elegant people can hear bamboo rhyme from the sound of the piano, and bamboo has a "knot", so ancient literati prefer bamboo and think that bamboo has the character of character and can make people not vulgar. So, from Qin to bamboo, to Aegean.