Guadagnino brought them Challengers, which will be released this month. Reznor said, “He started us down a path, saying, ‘What if it was very loud techno music through the whole film?’ ” (This is exactly what it turned out to be.)“I wish I had his notes,” Ross said of Guadagnino. “His notes were so fucking funny on what each piece was meant to do.”“Oh, yeah,” Reznor said. “ ‘Unending homoerotic desire.’ It was all a variation on those three words.”