The Beatles' biggest U.S. single — nine weeks at Number One — Paul McCartney wrote "Hey Jude" in June 1968, singing to himself on his way to visit Lennon's soon-to-be-ex-wife, Cynthia, and their son, Julian. The opening lines were, McCartney once said, "a hopeful message for Julian: 'Come on, man, your parents got divorced. I know you're not happy, but you'll be OK.'" McCartney changed "Jules" to "Jude" — a name inspired by Jud from the musical Oklahoma! — and presented a demo tape to Lennon, who loved the song.

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