Lu, Lu xūn (pictophonetic sound. From the soil, the sound of smoke. Original meaning: an ancient wind instrument made of clay, the size of which is like a goose egg, with six holes and a mouthpiece at the top. Also called "Tao Xun") has the same original meaning. It is also made of stone, bone and ivory.

Xun is one of the important musical instruments in ancient China. More than 3, years ago, in ancient China, musical instruments were divided into eight types, namely, gold, stone, earth, leather, silk, bamboo, silk and wood, which were called eight tones. Among the eight tones, Yu monopolizes the local sound. In the whole ancient band, it plays the role of filling the alto and harmonizing the high and low notes. The ancients said: "Five tones are positive, six tones are adjusted, rigidity and softness must be in the middle, and the lost is lightly taken away. The stone and stone are treated with the same respect, and the pole is lifted." We should regard Yun as the same as Zhong and Qing, and have the same status.

Yan is a unique closed-mouthed musical instrument in China, which occupies an important position in the history of primitive art in the world. The origin of Yan is related to the labor and production activities of ancestors. At first, it may be made by ancestors to imitate the sounds of birds and animals to trap prey. Later, it evolved into a simple musical instrument with social progress, and gradually increased the sound hole, and developed into a melodic instrument that can play tunes. In primitive society, the casket has various shapes, such as the pottery casket excavated at Hemudu site in Yuyao County, Zhejiang Province, which is oval, with only blowing holes and no sound holes, about 7, years ago. The pottery whistle of Yangshao cultural site in banpo village, Xi 'an, Shaanxi Province, is slightly shaped like an olive and has only one blowhole. It is molded by fine mud, which is one of the original forms of the tomb, about 6, years ago. Compared with the primitive period and the Xia Dynasty, the Shang Dynasty's tomb developed greatly, including pottery, stone and bone, with pottery being the most common and mostly flat-bottomed oval in shape. During the Warring States period, the pottery casket was flat-bottomed and oval, but there were other shapes. After Qin and Han Dynasties, Yun was mainly used in the court music of past dynasties in the music history of China. In court music, there are two kinds of music: ode and elegance. The ode is small, like an egg, with a slightly higher sound; Ya Xuan has a large body and a deep sound, and often plays with Chi, a wind instrument made of bamboo. In The Book of Songs, the earliest collection of poems in China, there is a saying that "Bo's blows, while Zhong's blows", which means that in order to facilitate fingering, the complicated crossing fingering should be reduced as much as possible, and the sound holes are arranged in the order similar to those of a flute. Professional players can play 26 tones, including all semitones and one overtone within two octaves. It is said that two brothers, one blowing and the other blowing, express the brotherhood of harmony and goodwill.