They chose to include all of these dissonant voices together.

他们把那些不和谐的声音也放在了里面。

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If I play the D above it, it's dissonant, the D below it,it's dissonant, but let's say I go down to the A below it, allowing a little separation between the two pitches now.

如果我弹它上方的D音，这个声音是不和谐的，它下方的D音，不和谐，但是如果我弹它下方的A音，让这两个音高之间产生一点空隙。

耶鲁公开课 - 聆听音乐课程节选