Hildur Gudnadóttir ("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.