At Muddy Waters’ house , impromptu jam sessions with pals like Howlin’ Wolf and Chuck Berry erupted in the front yard. Waters, of course, was Chicago’s main bluesman, so everyone who was anyone came to pay homage. Waters lived here for 20 years, until 1974, but today the building stands vacant in a lonely, tumbledown lot. It’s private property, so you can’t go inside. A sign commemorates the spot.