How to Take All the Advice in 'Hey Jude'

The Beatles single “Hey Jude,” the band’s longest-running #1 hit, turns 50 on Sunday. Paul McCartney wrote it for John’s son Julian Lennon, about dealing with John’s affair with Yoko Ono and separation from Jules’s mother Cynthia. But Paul’s advice is broad enough that every fan can read their own meaning into it.…