For many years, Paul McCartney, Ringo Starr and George Harrison toiled over what they knew would be the last ever Beatles song.
Haunted by the voice of their late bandmate, John Lennon, who sang gently at his piano from his home in New York, the surviving trio sweated in the studio trying to get a clear sound from the muddied recording given to them by Lennon’s partner, Yoko Ono.
