What are the five tones?

pentatonic refers to the angle, sign, palace, quotient and feather in China's pentatonic scale.

The intervals between adjacent two tones in pentatonic are all sophomore except for the third degree between Angle and Sign, Feather and Palace (the house with an octave higher). It belongs to the five elements in ancient China.

There is also an ancient work "Five Tones", which is an article recorded in the ancient military work "Six Taos" and recorded in the "Long Taopian"-on military organizations. This paper introduces the method of observing and judging the enemy's situation with five tones and five elements.

judging the enemy's situation and even directing the use of troops according to the matching of five tones and five elements is almost absurd and unreliable. However, his idea of using various means to detect the enemy's situation, judging the enemy's situation through various clues and making corresponding decisions still has some merits. Nian Gengyao, the general of the Qing Dynasty, was alerted by Wen Yan, which is such an example.