Seven tones-the earliest concept of seven tones in known literature, judging the scale structure from the pitch of seven of the twelve tones. The appearance of this term illustrates the Spring and Autumn Period. The scale has always been viewed from the perspective of the relationship between palace tones. The feather numbers on the upper corner of the palace correspond to 12356 respectively, which is more appropriate: National Seven Music: Gong, Shang, Jiao, Qing Jiao, Zheng, Yu and Bian Gong, which correspond to 1, 2, 3, 4, 5, 6 and 7 respectively, which is similar to the western natural sounds, and Qing Jiao is the second above the horn sounds. The change of the palace is the second degree below the palace tone. Yala: palace, business, horn, sign, sign, feather and palace change, corresponding to 1, 2, 3, 4, 5, 6 and 7 respectively. The symbol change is two degrees lower than the symbol. Gong, Shang, Jiao, Qing Jiao, Zheng, Yu and Leap correspond to 1, 2, 3, 4, 5, 6 and 7 respectively, and Leap is a sophomore below Gong Yin. About the law of five degrees: starting from 1, do five degrees continuously: 1, 5, 2, 6, 3, and then put in an octave, which is 1, 2, 3, 5, 6. References:
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