A vintage American lithographic concert poster, The Who and the James Gang at the Philadelphia Spectrum, June 24, 1970, Electric Factory. Titled in the print upper to the center. Marked and copyright 1970 Electric Factory Concerts lower left. James Gang was an American rock band formed in Cleveland, Ohio in 1966. The Who, British rock group that was among the most popular and influential bands of the 1960s and '70s and that originated the rock opera. Vintage and Modern Festivals and Concerts Memorabilia Posters, Graphic Art Prints, and Collectibles.