如在多声部音乐萌芽时期除了应用八度音程以外，人们只采用频率比数最简单的，即音响最协和的纯五度与纯四度音程；
Such as at the beginning periods of several-department music, people always adopt to the the most simple frequency or the purest perfcet fourth and fifth interval.
如在多声部音乐萌芽时期除了应用八度音程以外，人们只采用频率比数最简单的，即音响最协和的纯五度与纯四度音程；
Such as at the beginning periods of several-department music, people always adopt to the the most simple frequency or the purest perfcet fourth and fifth interval.
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