All hail Hildur Guðnadóttir‘s cello-ish Joker score, which seems to seep into and finally inhabit Arthur Fleck’s tortured psyche. A classically trained cellist, the 37-year-old Guðnadóttir is an Icelandic musician and composer. She’s played and recorded with several bands I’ve never heard of, including Pan Sonic, Throbbing Gristle, Múm and Stórsveit Nix Noltes.