Paul McCartney - hey jude live back in the us, 2002

"Paul McCartney wrote "Hey Jude" to comfort Julian Lennon, John’s 5-year-old son, during his parents’ divorce. Julian only found out the song was about him years later... and by then, Paul had been closer to him during that painful time than his own father was. John even mistakenly thought the song was about him and Yoko at first. So the world’s most famous comfort song is literally a little boy’s heartbreak... and he didn’t even know it was for him until he was grown up."