来自《耶鲁大学开放课程：聆听音乐 第7集 第7集》

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  it's going to create what?
  那会产生什么效果
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  A dissonance and we don't want--we don't like dissonances.
  不协和和弦 我们不喜欢不协和和弦
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  If we're going to have dissonances, we got to control them.
  如果会出现不协和和弦 则必须控制它
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  If--unless I change that chord underneath when I get up here,
  除非进行到这里时我改变下面的和弦
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  that's very dissonant.
  就会很不协和
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  It doesn't sound very silent for "Silent Night" There,
  在《平安夜》 听上去一点儿也不平安
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  so I need to switch to another chord
  因此要转换到另外一个和弦
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  and then switch back to the original.
  然后再换回原来的
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  And so we change chords to make the harmony consonant
  所以变换和弦 是为了使和声协和
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  or to make the harmony harmonious.
  或者说使和声和谐
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  All right. So that's something that we need to keep in mind.
  好了 这些大家要记住
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  Here's something else that's-- we're going to ask you to focus on
  此外 还有一些要大家注意的