I think repetition matters too. Songs get played during certain periods of life over and over, so your brain attaches them to that time. Later one play brings the whole folder back.
Why can one song bring back a memory so strongly
A song came on yesterday and suddenly I remembered a whole part of my life I had not thought about in years. It was weirdly emotional. Why does music do that more than normal sounds?
Replies discuss how music connects emotion, memory and time periods in the brain.
Answers & Discussion
Old songs are basically time machines. I heard one from high school last week and suddenly remembered a bus ride I had not thought about in 20 years.
Music is tied to emotion and memory at the same time, which makes it powerful. A song is not just sound, it carries where you were, who you knew, what you were feeling and what was happening then. That combination can bring back a whole season of life instantly.
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