CORNFLOWER BLUE Run Down the Rails cornflowerbluemusic.com Just as the “country” in country music need not refer only to America, such instruments as mandolins, fiddles and twangy guitars aren’t just for hat-clad, boot-scooting genre purists. That’s the takeaway from Run Down the Rails, the sophomore effort from this Canadian duo. Theresa McInerney and Trevor May know their Hank, Johnny and Willie, but they come at Americana via ’90s R.E.M....