来自《耶鲁大学开放课程：聆听音乐 第8集 第8集》

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  Can you come up with a visual image
  大家能否提出一种视觉图像
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  of how harmoney works?
  解释和声的原理
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  So we tried out a couple of things.
  于是我们想了几种
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  One of the things that we discussed
  其中一件
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  was this type of imagery here
  就是黑板上这种画面
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  where you have vertically these pillars, if you will,
  可以把这看成直立的支柱
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  or we could even call-- the more I sort of looked at this--
  其实我越看 越想叫它
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  sort of call them tree trunks almost.
  树木的枝干
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  And these tree trunks were the chords
  这些树干就是和弦
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  and at the base of each of these chords
  而这些和弦的底部
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  at least conceptually, theoretically,
  从概念和理论上来说
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  is this thing called the root.
  就是根音