A beautiful 1968 Muddy Waters concert poster from Denver, Colorado. This large cardboard gem presents a mystery right off the bat: What’s with that word “Paw”? I consulted some heavy Muddy authorities, including his biographer, and they haven’t a clue. Is it an obscure or erroneous song title, or possibly a nickname somebody gave him for five minutes? And then there are the glaring typos on the poster, which would send legendary keyboardist Otis Spann and Muddy’s More Real Folk Blues album running for cover. And no, vocalist Clear Waters was not related to Muddy.