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"The reason for the popularity is because of its simpleness, its stupidness," quotes Blecha. "He goes, 'three chords and the most mundane beat possible.' He goes, 'any idiot could learn it, and they all did.'"
This is a fun read!
https://www.npr.org/2023/10/31/1209181745/louie-louie-the-story-behind-the-song-everyone-knows-but-no-one-understands