Why do song lyrics get stuck in your head?
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The current widely accepted theory on why and how we enjoy music is that our brain is constantly searching for patterns. When we listen to music our brain is engaged in doing this and when it is able to predict and understand the pattern we get a release of dopamine. (This is suggested as to why we develop different tastes of music preferences as our minds work differently and therefore are able to predict patterns differently.) When your brain remembers a portion of a song or song lyrics it is being prevented from completing the pattern it knows and continues to go back to the same sequence of lyrics in order to accurately predict that portion of lyrics. This also explains why it usually does not get unstuck until you sing the song in its entirety or listen to the song.
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