Dad Rock: Beatles’ ‘Revolver’ Album Turns 50

Even though Sgt. Pepper’s Lonely Hearts Club Band gets the most acclaim, the Beatles recorded a masterwork a year earlier   with Revolver. This pivotal album showcased a  mix of musical styles, with songs filled with studio effects (the starts of the psychedelic age) and musicians beyond   only John, Paul, George and Ringo (a string octet, anybody?) .