It's difficult to choose, but I went for Fool on the Hill. I once read that Paul McCartney was taught to play the recorder by one of the Ashers, specifically for the track, but the story may be apocryphal. On another day, I might opt for I Am the Walrus. When I first saw the film I assumed they were coked up to the eyeballs, but now I think it is just weird. Nevertheless, the soundtrack compiles a lot of great tracks, including Hello Goodbye, Penny Lane and All You Need is Love.