system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why, sometimes, you dislike a song at first, but after hearing it a few more times you begin to like it.
gpt
Music is all about patterns and repetition, but just simple repetition is boring, so there is also change. So music sits on the boundary between predictable/boring, and chaotic/incomprehensible. This is something you will notice in almost all music, that it sets up a pattern, and then changes it before it becomes predictable. The music builds expectations and then either fulfills those expectations or doesn't, depending on the effect the composer is trying to achieve. Establish the pattern then break the pattern, change it into something else - familiar, recognisable, but different. The next verse is the tune you know but with new words. Then the chorus uses different chords, or the same chords but a different rhythm, or a different order, or the same thing with a new instrument, or a different melody over the same chords. Some things predictable, some things unexpected.

Point being, much of the effect of music relies on expectations, so it really makes a difference whether you know the song or not. Some songs that you end up liking the most once you know them you don't like at first because they violate your expectations in ways you don't like. But once you know what's coming, you can enjoy the changes without being thrown by them.