Paul McCartney, ‘Ringo Starr,’ London, January 1964. (© 1964 Paul McCartney under exclusive license to MPL Archive LLP) McCartney has also long harbored a sense of earnest silliness, seen in photos of ...

Paul McCartney and Ringo Starr on the train on the way to Bangor in Wales for meditation weekend with the Maharishi Yogi, Aug. 25, 1967. Mirrorpix via Getty Images.