"There's nothing you can know that isn't known." All You Need is Love (Magical Mystery Tour): John Lennon advocates metaphysical anti-realism and endorses the conclusion of Fitch's paradox.
"Without going out of my door I can know all things of earth." The Inner Light (Lady Madonna single): Harrison defends the synthetic a priori.
"Her name was Magil, and she called herself Lil, but everyone knew her as Nancy." Rocky Racoon, (The White Album): McCartney elaborates Frege's sense/reference distinction.
"Penny Lane is in my ears and in my eyes." Penny Lane, (Magical Mystery Tour ): McCartney endorses a rather extreme form of anti-realism.
Next up: Bruce and Philosophy?