Siren sisters CocoRosie just released their fourth LP, Grey Gardens (Sub Pop). Parisian transplants and aficionados of the avant-garde, Bianca (Coco) and Sierra (Rosie) Cassidy fuse the tradition of folk with the swagger of blues and the drama of opera. CocoRosie’s latest delves deeper into the folklore fostered by the duo’s Kahlo-esque appearance and mystic, mind-blowing soundscapes. The resounding notes of “Lemonade” are rich like a concerto, unfolding into raspy backbeats, buzzing synth and vocals that bring to mind Lady Day. Grey Gardens is CocoRosie at the threshold of its peak, reassuring listeners that the best is yet to come.