Paul McCartney has written some of the greatest songs of all time, but one track penned by his 1960s rivals makes the Beatles legend 'break down in tears'

Sir Paul McCartney has written some of the most iconic songs of all time, but there's one track written by one of his 1960s rivals that reduces him to tears.

The Beatles legend Paul McCartney has opened up about his all-time favorite song, which surprisingly isn't one of the many hits he wrote with the iconic band.