How did the ancients create melodies?

In ancient times, people wanted to record the melody and convey it to each other.

In order to establish the standard of melody, it is said that in the shadow of Kunlun Mountain, the ancients hollowed it out with different lengths of bamboo. When the weather turned cold, they buried it in the hollow of the mountain, leaving only a hole flush with the ground and sealing the exposed hole with bamboo pieces. In the second year, with the climate warming, the accumulated airflow on the earth began to surge. One day, the big bamboo tube with the largest rustic concentration burst out of the bamboo film first, making a "buzzing" sound, which was called "yellow bell" by the ancients. The other eleven tones are determined by the three-point profit and loss method, thus making twelve tones. Huang Zhongsheng gave birth, Lin Zhongsheng was too clustered, too clustered, Lu Nan gave birth, Gu Xi gave birth to Zhong, Ying Zhong gave birth to Da Lu, Da Lu gave birth to Yi, and Yi gave birth to Zhong Lu without shooting.

Later, due to the long journey to Kunlun, the climate changed every year. "Therefore, from winter to summer, the son of heaven often ordered the palace to the sun ... Chen Bayin, listening to songs, watching the scenery, waiting for the law, exercising the dust and benefiting Yin and Yang. In winter, when the sun is shining, the music is clear, the scenery is long, the yellow bell is connected, and the dust is light and balanced. In summer, when Yin Qi is in harmony, the music is turbid, the scenery is extremely short, guests pass by and the dust is low. ..... The way to wait for the weather is to have three rooms, the doors are closed, and the "gap" will last for several weeks, all of which are twips. Take wood as a case in the room, and each method is one, which is high inside and low outside. From its orientation, add laws to it to suppress its inner end and wait for the case. The angry ones are gray. It is pneumatic, and its dust is dispersed; People and the breeze gathered in the ashes. Waiting in the temple, using jade method 12. But the next day, you can wait for the funeral, and the bamboo method is sixty. Treat the day like a calendar. "History of the Later Han Dynasty Lu Chunqiu" records: "The emperor ordered Linglun to be the Dharma, and Linglun was the shadow of the Kunlun Mountain in the west of Xia, taking bamboo from the Kunlun Valley and blowing it for three inches and nine minutes, thinking it was a palace of yellow bells, blowing four houses and below, and making twelve barrels at a time.

The second law ... The Yellow Emperor ordered Linglun and Rongjiang to cast twelve bells to harmonize five tones. "Here, Huang Zhong's three-inch and nine-point system was clarified, which made an earlier written record for the formation of the twelve laws of three-point profit and loss. It provides a clear written basis for modern people to study China's temperament. " Note in the Book of the Later Han Dynasty: "Bamboo sounds are irreconcilable, pretending to be accurate, and the shape of accuracy is like a harp. Thirteen strings long and nine feet hidden, which should be nine inches according to Huang Zhonglv; The middle chord, with a sense of proportion, is thought to be 60% turbid. This paper expounds the relationship between legal norms and string law.