After twin sisters Allison and Katie Crutchfield ended their band P.S. Eliot in 2011, Katie started recording on her own as Waxahatchee. Her first album, last year's American Weekend, was well-received, but the buzz has grown much louder around the follow-up, Cerulean Salt. No wonder: Crutchfield alternates between kicking out gritty guitar rockers and charming, handmade folk-pop songs full of brainy, introspective lyrics that she sings in a wispy voice.