This double bill, curated by Rosanne Cash, showcases the novel ways traditional roots music continues to evolve. Anna & Elizabeth embrace the timeless folk-ballad tradition as their soulful voices intertwine with acoustic instruments and electronic effects to share these moving tales of love, loss, and betrayal. The Low Anthem blends clear, pure vocal harmonies with dashes of electronica and ambient sounds to create a unique brand of spare, subtle, and deeply eloquent music. The Providence-based band’s newest recording, The Salt Doll Went to Measure the Depth of the Sea, has been called “truly an album like no other” by NPR.