Revered for her multi-award-winning scores for film and TV (Chernobyl, Joker, Tár), Hildur Guðnadóttir released her debut album, Mount A, in September 2006. Mount A’s 20th anniversary was an opportunity to take stock. “Seeing that number on the horizon felt like a good moment to pause,” says Guðnadóttir. “When I was trying to be a one-person string orchestra, I always …