Bellflur Thursday’s opening band for the DAM! Festival show at DC9 was Gaithersburg’s Bellflur. Initial impressions that they were (very) heavily indebted to OK Computer-era Radiohead proved true, with the band either attacking most songs with a “Paranoid Android”-like aggression, or plodding through “You and Whose Army?” style ballads. There were nice touches though – a full arsenal of effects pedals and some spooky vocal lines – and the band has a knack for making…