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SAN FRANCISCO - JULY 1968: Blues musician Howlin' Wolf poses for a portrait session holding an Epiphone hollowbody electric guitar behind the Fillmore in July 1968 in San Francisco, California. (Photo by Sandy Guy Schoenfeld/Michael Ochs Archives/Getty Images)

SAN FRANCISCO - JULY 1968: Blues musician Howlin' Wolf poses for a portrait session holding an Epiphone hollowbody electric guitar behind the Fillmore in July 1968 in San Francisco, California. (Photo by Sandy Guy Schoenfeld/Michael Ochs Archives/Getty Images)