Tania May-Bowers knows how you spent those lonely nights: curled up on the floor, flickers of street light invading your room, and your ex’s Cowboy Junkies and Mazzy Star records spinning endlessly. The last time it happened to Tania, she transformed herself into Via Tania, in which guise she writes ethereal dirges like a depressed female Sam Prekop. Under a Different Sky has a few surprises in store, including two dangerously off-kilter collaborations with Prefuse 73, who walks the narrow line between his cutup beats and Tania’s gauzy vocals like a nervous new suitor.