Bonfire night, 1973. The Who are 50 minutes into their set at Newcastle’s Odeon Cinema, the first gig of a three-night stand. They’re promoting Quadrophenia, the grand new opus written by Pete Townshend, but all is far from well. Audiences have been struggling to grasp the ambitious concept, leaving both Townshend and Roger Daltrey to explain the story between numbers. It’s been disrupting the flow, cramping The Who’s swashbuckling attack. And t…