It was a hot Midwestern night at Lollapalooza in Chicago, but that didn’t deter a frenzied crowd from showing their support for metal legends Black Sabbath, who made their U.S. return Friday night (Aug. 3) at Grant Park. Though the Black Keys, one of the biggest concert draws going these days, were playing opposite Sabbath on the other main stage, the metal godfathers more than held their own with the