Paul McCartney is one of the greats. With The Beatles he wrote the book on how to play bass in a rock band. However, one song remains a test still.

Music legend Paul McCartney, whose alias inspired the name of a legendary rock band, has revealed the backstory of the strain with his former bandmate, John Lennon, after The Beatles went their separate ways in 1970.

John Lennon and Paul McCartney penned some of the biggest hits in the history of music but they didn't always see eye-to-eye and were both critical of each other's work