Hard to believe but it is true. Neither member of the Beatles could read or write music. The Fab Four, which consisted of John Lennon, Paul McCartney, George Harrison, and Ringo Starr, knew how to play their instruments, but they did so by ear and by memory.
For clarification purposes, they weren’t able to write music in the sense of writing down music notation (notes, beats, rests, tempo, etc). They were just collectively good at writing lyrics, creating melodies, and then putting them all together. Lennon was once quoted as saying:
“None of us are technical musicians. None of us could read music. None of us can write it. But as pure musicians, as inspired humans to make the noise, they [referring specifically to Paul and Ringo] are as good as anybody.”