He started with the lowest instruments and then goes to the high instruments and then back to low instruments at the end.

他开始使用声音最低的乐器,然后转向高音乐器,最后回到声音低沉的乐器

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So there's a kind of wedge shape with regard to the instruments too.

就是说在乐器的使用方面,也存在一种楔形模式

耶鲁公开课 - 聆听音乐课程节选