The Beatles' success was largely driven by the songwriting prowess of Paul McCartney and John Lennon. They were the dynamic duo behind the band's phenomenal success, whether they were co-writing or independently crafting songs before sharing them with each other.

Paul McCartney said much of what John Lennon said about him stung. He revealed one thing that was particularly hurtful.

Another song which the Beatles legend finds particularly moving is Billy Joel's 1977 single 'Just The Way You Are'. Written by the New York native as an ode to his wife, the song is one which Paul said he wishes he'd written.