system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why as you increase the speed of a song, the pitch gets higher.
gpt
Sound is basically vibration in the air. Our brain detects slow vibrations as lower notes and fast vibration as higher notes. For example on a guitar if you don't have you fingers on the string the entire string vibrates causing it to make slower vibrations. If you place your finger on the stringer and strum the guitar the sound becomes more high pitched because the vibrating part is smaller and thus vibrates faster cause it's smaller.

If you speed up sound like on a record, your effectively speed up the vibration in the song. Because your speeding up the vibrations you brain things the song is playing faster.