Chemistry was one of those subjects in school that I was never good at… but I think it's the unknown bit - the mysterious spark - that does it. It's the same with the Stones. I mean, line 'em up against a wall, and they're the most unlikely good rock 'n' roll band that you could find!… There's something to be said for a certain chemistry between people that makes for a certain kind of music.
— Keith Richards
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