In the world of film scores, there are many composer/director relationships that get a lot of notoriety. But in the last twenty years, co-composing has become more accepted and just as celebrated. Many times – due to the nature of the business and the timelines on certain projects – it is simply a necessity. Whether it’s temporary help, or invaluable creative input throughout the assignment depends on the project, but having that extra bit of assistance can bring a new voice, err sounds and ideas to the palette. Hans Zimmer and James Newton Howard on the first two Nolan Batman films, Trent Reznor and Atticus Ross on The Social Network,…