On Saturday night, Olivia Rodrigo sang Carly Simon’s classic “You’re So Vain” at the Rock And Roll Hall Of Fame induction ceremony in Los Angeles. Carly Simon was being inducted into the Hall Of Fame, but Rodrigo wasn’t originally scheduled to sing the song on her own. Instead, Rodrigo was scheduled to perform the song with her friend Alanis Morissette. (Rodrigo recently sang “You Oughta Know” onstage with Morissette and then inducted Morissette into the Canadian Songwriters Hall Of Fame.) Rodrigo and Morissette rehearsed the cover of “You’re So Vain” together, but Morissette backed out of the Hall Of Fame ceremony at the last minute. This morning, she explained why.