"Hey Jude" was written by Paul McCartney to comfort Julian Lennon during his parents' divorce.
Originally called "Hey Jules," Paul changed the name for a smoother sound but kept the message - hope and reassurance through pain.
It’s four-minute "na-na-na" coda turned it into a shared, sing-along moment, and at over seven minutes long, it became one of the longest songs ever to top the charts - proving emotion can outweigh convention.