Music taps heavily into the pattern recognition centers of the brain. Basically our brain loves trying to predict the next note, next verse, when the chorus will hit, etc. and the brain releases endorphins (feel good signals) every time it either guesses a new pattern correctly or is pleasantly surprised by a brand new sound.
The more we listen to a song, especially on repeat, the less surprises the song will hold and easier the patterns are to predict or remember.
Fun fact: this is also why if you get a song stuck in your head listening to the entire song 2-3 times in a row will usually get it out of your head.
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