We mention this in our new book but probably it deserved a longer take: The Beatles' song "Because" off Abbey Road is based on the famous passage in the Moonlight sonata's opening movement, played backwards. Once you know that, it is obvious, especially since the intro is played on electric harpsichord (by George Martin). John Lennon was quoted explaining: "Yoko was playing Beethoven's 'Moonlight Sonata' on the piano ... I said, 'Can you play those chords backwards?' and wrote 'Because' around them." Please, no jokes about hearing "Paul is dead" on this.