来自《耶鲁大学开放课程：聆听音乐 第10集 第10集》

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  I should say that all three of these forms are very old.
  这三种曲式都非常古老
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  I could go back into the Middle Ages
  在中世纪的应答圣歌中
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  and get a responsory of the Middle Ages
  我可以找出一段
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  that is in A B A form.
  A B A曲式的作品
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  I could go back into the Middle Ages
  也可以从中世纪
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  and bring up an early fifteenth-century English carol
  十五世纪英国的礼赞中
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  that's in verse and chorus form.
  找到一段主歌副歌曲式的作品
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  I could go back into the Middle Ages
  我还可以在中世纪的
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  and find you instrumental pieces
  器乐作品中
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  that are in theme and variation form.
  找到变奏曲式的例子
• 
  
  So these three are very old.
  这三种曲式都很古老
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  Now,the fourth one that we talked about,
  而我们将要讲到的第四种