A mere eight months after The Beatles released Rubber Soul, thus establishing an artistic depth and stylistic variance that exceeded the band’s out-of-bounds pop appeal, we received Revolver. While it opens with George’s topical Taxman, Paul quickly cuts deep with Eleanor Rigby, an elegy of devastating loneliness set to a string quartet. Just as things get heavy, Ringo sings the tune that forever endeared The Beatles to children: Yellow Submarine. Meanwhile, George is getting metaphysicial with Love You To while John gets trippy on I’m Only Sleeping and, at album’s end, the pioneering psychedelic exercise Tomorrow Never Knows. Amazingly, Revolver still sounds cohesive and thrilling while displaying The Beatles’ almost frightening escalation of pop art maturity.