The journey to write Amazon's Sound of Metal took well over a decade. But for writer-director Darius Marder and his writing partner and brother, Abraham Marder, that length of time was necessary to tell a "universal story" that explores "something that is pervasively human." The film follows Ruben (Riz Ahmed) and his girlfriend, Lou (Olivia Cooke), who perform as the heavy-metal duo Blackgammon.