"John said that this was based on Beethoven's Moonlight Sonata, on hearing Yoko play it and asking her to play it backwards. Personally, I can't hear the connection at all.
"It was an amazing recording, and probably the first bit of real camaraderie between the boys. I think they liked putting down their instruments and just singing together for a change. John, Paul and George sat in a semi-circle to do the harmonies and Ringo sat off to the side to lend moral support."
"We recorded the vocals multiple times until we finally had it right, but the funny thing was, each take was brilliant. They sang flawlessly. So what you have is nine-part harmony: three Beatles' voices times three. They made up their own choir."