Why does making audio tracks shorter make them sound more high pitch
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Sound comes from air wiggling, and the pitch of the sound is related to the speed; more rapid wiggling with less time between consecutive wiggles is a higher pitch. The simplest method of speeding up an audio recording is to just play it faster, which makes the wiggles happen more rapidly and reduces the time between wiggles, making the pitch rise. Because of how we perceive sound, doubling the speed will make the pitch rise by one octave.
As a side note, it is possible to speed up audio without changing the pitch. Try changing the speed of a Youtube video to see that in action. However, it does take a computer doing a bunch of math to make that work.
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