Paul McCartney doesn't read or write music. Neither, he says, did John Lennon:
"Someone once told us that the Egyptian pharaohs couldn't read or write -- they had scribes to put down their thoughts. So John and I used to say, 'We're like the pharaohs!'''
From "When I'm Sixty-Four," a profile of Paul McCartney by John Colapinto (New Yorker, June 4, 2007)