Our latest guests on soundtracking are not only composers, but also brothers, who between them have built up an extraordinary body of work for both film and television. Indeed, it's on the small screen that Harry and Rupert Gregson-Williams have joined forces for only the second time, on Julian Fellowes' New York high society drama, The Gilded Age. We'll talk about that and several of the other projects they've been involved with, including Catch-22 for George Clooney.