来自《耶鲁大学开放课程：聆听音乐 第8集 第8集》

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  but now to get a sense of harmony
  但是为了理解和声
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  we're going to listen to the bass.
  我们要听一下低音部
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  And we said last time we want to do two things.
  上节课我们说过要做两件事情
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  We want to figure out if the harmony is changing,
  一是弄明白和声是否变换
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  and if it is changing
  二是如果和声变换
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  whether it's changing at a regular or irregular rate.
  那么是不规则变换还是规则变换
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  By regular rate we mean that the amount of time
  规则变换意思是
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  that each chord holds is exactly the same;
  每个和弦持续的时间是相同的
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  every chord holds for the same length of time.
  每个和弦都持续相同的时长
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  If one chord holds twice as long or only half as long,
  如果有一个和弦持续了两倍或一半的时间
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  then we have an irregular harmonic change--
  那么就是不规则和声变换
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  irregular rate of harmonic change.
  和声的不规则变换