The Beatles - hey jude, 1968

"In 1967, John Lennon had left his wife and son and was living with Yoko Ono. Paul McCartney didn’t want Cynthia Lennon to think he’d also abandoned her and Julian, just because John had left, so he drove to see them in Weybridge. Being a songwriter, he naturally began making up a tune as he drove. He hoped Julian wouldn’t start crying, that would just make a sad situation worse. So he sang: “Hey Jules, don’t make it bad. Take a sad song and make it better.” In the event, although he liked the song, he thought ‘Jules’ was a bit awkward to sing. So he changed the name to Jude, and the song became ‘Hey Jude’."