He was a comedic singer/songwriter for the Pythons, founded the Rutles (I know I'm not the only one who remembers them!), a Beatles parody band, and a serious musician who continued to tour into his 70s.
I remember all of the "How dare you!"s after the Rutles' debut, but the Beatles thought it was a hoot. More about him here:
https://www.foxnews.com/entertainmen...ongwriter-dead