来自《耶鲁大学开放课程：聆听音乐 第8集 第8集》

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  Yeah, I think there were four chords there
  对 我认为有四个和弦
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  so we had change.
  现在我们知道和弦是变化的
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  Yes, there was change.
  没错 变化的
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  It was regular
  并且是有规律的变化
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  and it happened to involve four chords.
  而且涉及到四个和弦
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  Okay. Pop music--we've been using some pop music here.
  好了 我们刚刚听了些流行乐
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  We've talked about why we use the pop music.
  并且我们讨论了为什么使用流行乐
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  Let's talk about what the difference
  让我们谈谈流行乐和古典乐之间
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  between pop and classical music is.
  有什么区别
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  We've touched on this a little bit before
  之前我们已经讲过一点了
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  but let's play with this again.
  现在我们再深入点
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  Let's say you go home for Thanksgiving break
  假如你回家过感恩节