Out of the blue, Imagine Dragons went stellar in 2013 with their debut album Night Visions… In the language of smartphone app development, Imagine Dragons were “born global”, ready to be played from Seattle to Sydney. On Hear Me, they out-Killer the Killers. They have successfully assimilated the hushed American Gothic of Arcade Fire, the democratising hoedown of Mumford & Sons, and the polite triumphalism of Coldplay. It’s an impressive, almost overwhelming synthesis of commercial influences, including, in their monster hit Radioactive, some rather mannered dubstep wubs. Their follow-up Smoke + Mirrors currently delivers another string of potential worldwide smash hits…