Crimson and Clover - Joan Jett

Did not know this was a cover for a VERY long time. And when I found out my reaction was like ‘huh. Can’t possibly be better.’ (Her version is now on my beloved playlist of covers where the singer didn’t switch the pronouns.)

Runner up: I Want You To Want Me as sung by Letters to Cleo on the 10 Things I Hate About You soundtrack. Took me less long, but…still a while!