5. Beatles, 'Rubber Soul'
The laughing plant began to seep into the Beatles' sound not long after they famously smoked it with Dylan in 1964. On Rubber Soul they seep turned into a torrent, from the sitar-drone wanderlust of "Norwegian Wood" to the joint-passing deep-outs "Think for Yourself" and "Nowhere Man" to the introspective isolation of "You Won't See Me" and "I'm Looking Through You." "Rubber Soul was the pot album and Revolver was the acid," John Lennon said in 1972. "The drugs are to prevent the rest of the world from crowding in on you."