Nate Bergman is a man of many voices. Just listen to his album, and you get some raspy folk, country rock god, and even a spot of gospel mixed with a burst of soul. Tonight, Bargman stripped back to just him and a guitar—two guitars, in fact, as he swapped between acoustic and electric for the selection of tracks he played tonight, some taken from that album. Tattooed and dressed in black, his explosive opening with the track ‘War On The Working Class’ got the audience’s attention, and he kept them enraptured throughout the 45-minute set he was allowed. Just his third solo gig supporting Amigo The Devil, he undoubtedly…