Arcade Fire were going into the studio with Murphy to work on their fourth album. He said at the time: "They're in with James Murphy on three or so songs, plus Markus Dravs who is a long-time collaborator. They write too many songs - that's a good problem to have. There's around 35 songs with Arcade Fire, two albums'-worth for sure."
Murphy clarified his role on the album saying: "They are so good they could produce themselves, so my role in the band depends on the song," he explained. "Sometimes I'm going around making suggestions and playing instruments, other times I'm just helping the arrangements. We feel like part of each other's bands because we toured a lot together over the years."