Per Oldaeus heard Professor Longhair for the first time in 1973. Longhair’s 1959 Ron Records release, “Cuttin’ Out,” was in a stack of vinyl 45s a friend had brought home to Sweden from New Orleans. “Cuttin’ Out” hit Oldaeus like a punch in the stomach. “The parade drumming in it is fantastic,” Oldaeus said from Beddingestrand in southern Sweden. “John Boudreaux is a marvelous drummer.” Boudreaux’s drumming, of course, also drives the definitive recording of Lo...