One of the highlights of the Halo series of first person shooter games has been the music. Bungie's music director Marty O'Donnell was the person behind most of the memorable instrumental music in the Halo franchise since it launched in 2001 alongside the original Xbox. The classical orchestra sound combined with the gregorian chants remain some of the best music ever created for a game series.
With Bungie no longer developing the Halo series (they are now working on their unannounced game for Activision), Microsoft and Halo 4's developer 343 Industries had to find a new person to take on the role of its soundtrack creator. Today, the company revealed that Neil Davidge, best known as the producer of the UK-based DJ duo Massive Attack, will compose the soundtrack for Halo 4.
Besides his work as a producer, Davidge has composed music for a number of movies, including Push and Clash of the Titans. You can listen to a mix of two of his tracks for the Halo 4 soundtrack above. It's definitely similar to O'Donnell's work but there's no gregorian chants to be found in these samples.
Halo 4 is currently scheduled to be released by Microsoft in late 2012.