VH1 DECLARES WAR: Nashville sensations The Civil Wars, whose acoustic country-folk has been compared to Swell Season's Glen Hansard and Marketa Irglova as well as Richard and Linda Thompson and Robert Plant and Alison Krauss, have been added to VH1's "You Oughta Know" developing artist category along with Glassnote's Mumford & Sons and  Two Door Cinema Club. It marks the first time VH1 and sister station CMT have combined to promote an act across both networks. (3/30p)