The modest, wood-frame house at 1616 N. Galvez St. looks pretty much like all its neighbors, but the front door leads to a dynastic kingdom inside. Walk through the sparsely furnished living room and you come to the office of Bang-N-Records and the Bartholomew Boyz, where the sons and grandsons of New Orleans music pioneer Dave Bartholomew are still making records. The walls are lined with visual rep...