John Lennon: This is about me and Yoko in the early days. Yoko was playing some Beethoven chords and I said play them backwards. It's really "Moonlight Sonata" backwards.
Paul McCartney (in 1969) - "I like John's 'Because' on the second side. To say, 'Because the world is round it turns me on' is great. And 'Because the wind is high it blows my mind'"
John Lennon (in 1980) - "I was lying on the sofa in our house, listening to Yoko play Beethoven's 'Moonlight Sonata' on the piano. Suddenly, I said, 'Can you play those chords backward?' She did, and I wrote 'Because' around them. The song sounds like 'Moonlight Sonata,' too. The lyrics are clear, no bullshit, no imagery, no obscure references."