来自《耶鲁大学开放课程：聆听音乐 第7集 第7集》

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  We can flip this just a little bit.
  我们可以变一下
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  We can say, "All right. Here's our tonic up here"
  可以说 主音在这里
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  and go that way.
  然后这个方向
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  Tonic, sub-dominant, dominant, tonic,
  主音 下属音 属音 主音
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  that way.
  这个方向
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  So we could go--come up from the tonic or go down from the tonic.
  我们可以从主音上升 也可以从主音下降
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  Generally speaking,
  一般来说
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  composers are more likely to go down from the tonic
  作曲家们更喜欢从主音下降
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  and then come back up to the tonic
  然后再上升回到主音
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  and they aren't likely to go the other way.
  他们不太会用别的方式
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  So we've got these three basic chords
  那么 现在有了这三个基本的和弦
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  that we're going to talk about.
  细节一会儿再讨论