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Earworms often have a simple secret: the brain wants to complete an unfinished pattern. Short, repeating, predictable choruses can loop all day for that reason.
A chorus popping back up for no reason is annoying but logical. The mind is a pattern hunter; once it catches a rhythm, it hates letting go.
Repetition feeds the brain’s prediction engine. Each correct prediction gives a tiny “done” feeling; when the song stops, that feeling remains unfinished and the loop restarts.
A practical fix is to listen to the full track or deliberately imagine the ending. Closure can weaken the cycle.
It also explains why ads love short jingles. Your brain wants completion—and they turn that itch into attention.