Why Do Songs Get Stuck in Your Head

Turns out it has something to do with earworms, or more precisely the Germanic Ohrwurm. 

One theory is that earworms are a form of mild musical hallucination (normally a rare experience), the distinction being that with an earworm you (a) usually aren’t on drugs or suffering from schizophrenia and thus (b) are fully aware there’s no actual music being played outside of your skull. Another theory is that earworms are a side effect of your brain trying to consolidate memories, akin to what happens in REM sleep. Yet another possibility is pondered by neurologist Oliver Sacks in his book Musicophilia: earworms might simply be a consequence of our being surrounded by music in our lives whether we want to be or not.

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