By cultivating ancient roots and an overlooked language, Julie Fowlis has moved Gaelic song from the edge of the world (her home island North Uist is one of the Westernmost points in Europe) to center stage. Her latest album, Cuilidh —which means “treasury” or “secret hiding place” in Gaelic—is a trove of everything from lighthearted mouth music to serious ballads chronicling life and loss on the rugged island and its rough seas. Fowlis’ delicate, heartfelt renditions have moved major British celebrities, from Radiohead drummer Phil Selway to British comedian Ricky Gervais, and won Fowlis a spate of important U.K. music awards.