来自《耶鲁大学开放课程：聆听音乐 第14集 第14集》

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  or whatever it was that he brought in
  或是其他任何一首
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  and I started listening to
  当我开始听他唱歌时
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  that I thought :
  我就会想
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  "My God, he's got a descending tetrachord bass,
  天哪 它的贝斯是下行的四度音阶
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  ostinato, embedded in that."
  固定音型体现在其中
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  Now I'm sure Frederick didn't sit there scratching:
  弗雷德里克不会坐在那里挠着头说
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  "Oh, yes, there is my descending tetrachord bass there,"
  没错 那就是下行的四度音阶
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  but it's in there.
  但事实如此
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  It's embedded in so much of this popular music
  流行音乐中有如此多的固定音型
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  and that's kind of
  我们等会儿
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  what we're going to track here a little bit,
  就会听一首例子
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  but we're going to start with the Baroque.
  不过我们先从巴洛克时代开始