Memphis Slim would take the Blues to places it never imagined. He was a prolific author of many enduring classics of the Blues lexicon, including “Mother Earth,” “Everyday I Have the Blues,” and countless others. But as a performer, his everlasting significance was in opening unexpected doors, and letting the music take wing in places where it had never extended. Blues artists had often attained modest levels of popularity, but the bulk of the audience base was essentially derived from the black lower classes. Blues clubs, where common folk let loose at the end of the day, offered music that was ribald and highly suggestive. He was a fabulous keyboard player, an accomplished composer and a soulful vocalist. Like most adept blues pianists, his range goes beyond basic Chicago blues to boogie, jump blues and R&B flavors.