Billy Joel knows jukebox musicals—after all, his songbook inspired one of the very best ever, Movin’ Out. On April 24, the pop superstar checked out a performance of reigning jukebox champ Jersey Boys, which spotlights the life story and greatest hits of Frankie Valli and the Four Seasons. After the show, Joel and his lovely date went backstage at Broadway's August Wilson Theatre to pose for snapshots and congratulate the cast. He loved them just the way they were!