Not science just my thoughts but music activates a sympathetic response relating all the way down to our own heartbeat and breath. That sympathy is guided by mood, melody and if applicable lyrics to associations and memories.
If the song is new to us, and it activates those sympathetic associations effectively it maps itself quickly and then each subsequent listening reinforces itself. There is an effect of diminishing returns kinda like getting used to a drug but if you abstain from that song it can reactivate.
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