“We had to reeducate people how to respond to music,” says Stephen Mallinder , co-founder and front man of Cabaret Voltaire, a Dada-inspired avant-garde musical force born in the old UK steelworks city of Sheffield in the 1970s and starting a North American and European tour today in Seattle. Such an imperative was likely even more practical than aesthetic or intellectual, given that at the Cab’s very first gig 51 years ago at the University of Sheffield the crowd got so enraged by the band that they rioted and threw Stephen off the stage, landing him in hospital with a chipped backbone. More of that in the interview to come, but on the other side of the world even a decade after that, I saw people get royally pissed off by their singular sound.…