“When the young Bruce Iglauer witnessed a performance by Hound Dog Taylor and the HouseRockers in 1971, he created a record label so he could sign them. Iglauer was a 23-year-old blues fanatic and Taylor an unrecorded 54-year-old veteran of the Chicago blues scene, though his music reached back further, to the first stirrings of postwar electrified blues. Half a century on, Iglauer’s Alligator impr”