There"s a certain "beauty & the beast" quality to the greatest male/female, singer/songwriter duos. Consider Jane Birken hooking up with Serge Gainsburg, or Nancy Sintra and Lee Hazelwood. And so it is with "Ballad of the Broken Seas", an album length collaboration between Isobel Campbell and Mark Lanegan.There"s a similar contrast between Isobel"s aching, pristine chill of a voice and Lanegan"s wounded, regret-stewed burr.