Eli5: How do you remember lyrics of song you haven’t heard for years but forget stuff you studied in school?

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The original was posted on /r/explainlikeimfive by /u/askarurorua on 2023-06-27 23:43:02+00:00.

I can recall the lyrics of so many old songs I don’t listen to anymore, but can’t seem to remember the stuff I studied back in high school so like 12-13 years worth of information is all blur to me. Why does brain do that