What a weird musical coincidence: rocker and Beatle Paul McCartney, and famed record producer Richard Perry, each turn 73 today. Some music giants have the same birthday– Elton John and Aretha Franklin, for example– but they aren’t the exact same age. Anyway Happy Birthday to both of them. Did you know that Paul and Linda McCartney sang backup for Carly Simon on her song “Night Owl,” produced by Perry in 1972? It’s one of the many anecdotes from the memoir he’s writing about being one of the most successful producers in rock history.