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纯五度是五度相生律的源泉、纯律的源泉。若将它收缩一点,不那么纯、即每秒钟约一个拍音,便是十二平均律的源泉。要想知道Do、Re、Mi、Fa、Sol、La、Xi的音高标准是如何产生的,就得了解Fa、Do、Sol、Re、La、Mi、Xi这个五度相间的排列,并往高和低两个方向延伸而产生升的Fa、Do、Sol、Re、La、Mi、Xi或降的Xi、Mi、La、Re、Sol、Do、Fa的规律。要想知道纯律的大、小三和弦是怎样产生的,就得了解加在每一个五度之间的大、小三度会带来怎样的变化及升降号出现的原理。下图我称之为“五度线”。
Pure five degrees is the source of the five degrees of law, the source of pure law. Shrinking it a little, not so pure, that is about one beat per second, is the source of the Twelve Average Laws. To find out how the pitch standards of Do, Re, Mi, Fa, Sol, La, and Xi are generated, you need to understand the five-phase arrangement of Fa, Do, Sol, Re, La, Mi and Xi The law of Xi, Mi, La, Re, Sol, Do, Fa of Fa, Do, Sol, Re, La, Mi, Xi, To know how the major and minor chords of the pure law are produced, one must understand the changes that will occur in the major and minor third between every five degrees and the principle of the appearance of the ascending and descending numbers. The figure below I call “five degrees line ”.