I’m talking about vibrations. In music, it works best if one imagines hearing as a straight line, with the larger number of hertz on the high end and the smaller number of hertz on the low end. Any music you hear falls along that spectrum. Higher noises—like cymbals crashing together or a car stereo with the treble turned all the way up—fall on the high end. Sounds that demand the ear’s most eager attention. Sounds that are jarring enough to get a room to snap to focus. On the extreme end of this spectrum would be some guitar feedback, wrung through a speaker. The low end is where the bass and
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