What is pure law?

Pure law is one of three kinds of temperament, including the law of twelve averages, the law of five degrees and pure law. In fact, it is a method of calculating pitch. Pure law is mainly used to construct the second and third partials through the pentatonic scale, so as to determine the accurate heights of the seven basic tones of cdefgab. For example, the upward purity of C is G, the upward purity of C is E, the upward purity of G is D, the upward purity of G is B, the upward purity of F is C, and the upward purity of F is A, so CDEFGAB is determined.

The absolute and accurate height of each sound in the music system and the relationship between them are called temperament.

Melody is formed in the long-term development of music practice, and there are many kinds of melodies. The familiar melodies mainly include pure tone melody, pentatonic rhythm and twelve average rhythms. Among them, the law of twelve averages is widely adopted by countries all over the world. China's poetry has always been rhythmic. Although it was not until the Southern and Northern Dynasties that China discovered the difference between initials and finals from the input of Sanskrit, their ancestors still relied on intuition; At the source of poems such as The Book of Songs and Songs of the South, rhyming poems with harmonious rhythm were sung. The primary schools in Ming and Qing dynasties can sort out the overall changes of Chinese national language sounds since the pre-Qin period, and rhyming poems have contributed a lot.