Howl­in’ Wolf may well have been the great­est blues singer of the 20th cen­tu­ry. If you want­ed to play elec­tric blues, Howl­in’ Wolf was a man to watch. in 1965, open­ing for the Rolling Stones. The fol­low­ing year, the Rolling Stones insist­ed that Shindig! ’s pro­duc­ers “also fea­ture either Mud­dy Waters or Howl­in’ Wolf” before they would go on the show.