Paul McCartney revealed that the whole operation had to be kept top secret - even from those hired to play the music. The orchestra had no idea they were recording the Fab Four s last track.
Acclaimed director Peter Jackson - who was entrusted with the band s archives for documentary Get Back - cleverly used footage filmed for their 1967 hit Hello, Goodbye to make the scene work.
43 years after John Lennon s death - and more than two decades on from George Harrison s passing - The Beatles have come together again with the help of AI .
Now And Then, written and sung by John in 1977, features acoustic and electric guitar played by Harrison in 1995. Sir Paul McCartney completed the bass and Sir Ringo Starr recorded the drums.