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Their music has drawn variously from disco, electro-pop, UK garage, R&B—and Frank Sinatra. They bear traces of Munich, London, Chicago, Virginia Beach, Tin Pan Alley—and yet they hail from Hamilton, Ontario. They are men of the world, but you can call them Junior Boys. The men in question, of course, are Jeremy Greenspan and Matt Didemus, and their story is an unlikely one: two childhood friends who had no real intention of becoming professional musicians—and yet, six years after the almost...