4. Which Beatles' song has been recorded most by other artists?
"I got out of bed, sat at the piano, found G, found F sharp minor 7th - and that leads you through then to B to E minor, and finally back to E. It all leads forward logically. "I liked the melody a lot, but because I'd dreamed it, I couldn't believe I'd written it!" Paul McCartney talking about one of the most famous songs of all time. Can you guess which one?