There’s a mysterious quality to Big Thief, their songs have a familiar warmth that feels as though they could be made up of melodies you’ve known for years, but at the same time they don’t sound quite like anyone else. This makes listening to a new Big Thief album an oddly nostalgic experience. On U.F.O.F, the band’s third album and their first on 4AD, there are moments when their sound feels like it could belong to an esoteric forgotten 1960s folk album, another Vashti Bunyan-esque rediscovery, while there are other times when the fragile timbre and turns of Adrianne Lenker’s…