Hildur Guðnadóttir ('Sicario: Day of the Soldado') composed the 17-track soundtrack to director Todd Phillips’ original, standalone origin story 'Joker' which explores the world of—and according to—Arthur Fleck. Indelibly portrayed by three-time Oscar nominee Joaquin Phoenix ('The Master,' 'Walk the Line,' 'Gladiator'), Arthur is a man facing the cruelty and outright scorn of society, along with the indifference of a system that allows him to spiral from vulnerability into depravity. Caught in a cyclical existence teetering on the precipice of reality and madness, one bad decision brings about a chain reaction of escalating, ultimately deadly, events. Phoenix stars in the titular role alongside Oscar winner Robert De Niro ('Raging Bull,' 'The Godfather: Part II') as Franklin.