McCartney recalled: “Ringo said, ‘I don’t think I can really drum on that.’

“George added, ‘Well, I’m not sure what to put as guitar either.’ And John said, ‘I can’t think of anything. I think you should just do it by yourself. It’s really a solo song.’

“Now, this was kind of a big deal at the time because we’d never recorded like that before. It had always been the band. After some hesitation, I had decided to give it a go.”

McCartney revealed that an early idea was to record Yesterday as an electronic avant grade song, influenced by the work of Delia Derbyshire, who is best known for her work on Doctor Who.

LISTEN TO PAUL MCCARTNEY READING FROM NEW BOOK THE LYRICS BELOW (YESTERDAY FROM 10.45)