"Obviously I have a connection and a fondness for Johnny Cash, and his tone and his message and his music. But the real driver in all these decisions is trying to separate ourselves, in an accurate way, from the other superhero movies. We think we’re going to deliver something a little different and we want to make sure we’re selling audiences on the difference. Sometimes even when a movie’s a little different, the studio’s trying to market the movie just like all the others. [Cash's] music, in a way, separates us from the standard, bombastic, brooding orchestral, swish-bang, doors opening and slamming, explosions kind of methodology of some of these movies. … Hugh and I have been talking about what we would do since we were working on the last one, and for both of us it was this requirement that, to be even interested in doing it, we had to free ourselves from some assumptions that had existed in the past, and be able to change the tone a bit. Not merely to change for change’s sake, but also to make something that’s speaking to the culture now, that’s not just the same style — how many times can they save the world in one way or another? How can we construct a story that’s built more on character and character issues, in a way as if it almost wasn’t a superhero movie, yet it features their powers and struggles and themes? … We are in the future, we have passed the point of the epilogue of Days Of Future Past. We’re finding all these characters in circumstances that are a little more real. The questions of ageing, of loneliness, of where I belong. Am I still useful to the world? I saw it as an opportunity. We’ve seen these characters in action, saving the universe. But what happens when you’re in retirement and that career is over? … I think this movie is about family, and sticking together, and about making connections in a world in which our characters might feel very alone."