来自《耶鲁大学开放课程：聆听音乐 第23集 第23集》

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  or you suddenly turn on some sort of streaming FM, middle of the piece.
  或许你突然打开调频 听到某个乐曲的中间部分
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  What is it that's going to give you the most information?
  到底是什么给了你最多的信息
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  Roger.
  罗杰
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  Instruments,right,absolutely.
  乐器 对 非常对
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  Okay. It's the instruments,
  对 是乐器
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  because if you hear lots of percussion and xylophones
  因为如果你听到大量打击乐器和木琴
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  and things such as that banging away in a dissonant fashion,
  以及类似砰响的不协和音
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  those instruments just weren't there in time of Mozart, for example,
  那么 那些乐器不会在莫扎特时期出现
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  so you know it's got to be probably
  所以你就知道这段乐曲可能
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  late nineteenth-century and on.
  谱于十九世纪后期甚至更晚
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  So instrumentation is the single most important factor,
  乐器是最重要的一个单因素
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  but some instruments are common to many different periods.
  但是一些乐器在不同时期都运用得很普遍