 Complete the following phrase:  Since the early 2010s, Cianfrance had been working on a fictional documentary called Metalhead, which centered on a metal drummer who becomes deaf. The film featured the members of the band Jucifer portraying themselves. The project was developed for years with Cianfrance eventually passing the reigns over to his friend and The Place Beyond the Pines co-writer Darius Marder resulting in Sound of Metal 2019. Starring Riz Ahmed, the film premiered at the 