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I remember a time in the 90s when certain critics just didn’t believe that Jon Spencer’s impassioned retro-rock stage presence wasn’t some sort of ridiculous gimmick. Though some derided his band the Blues Explosion as a second-rate mimic of Canned Heat fronted by a white guy with Mr. Dynamite-era James Brown aspirations, for others his combination of dirty swagger and bluesman showmanship was a revelation.…