Music is usually the LAST or one of the last parts of a game that get put in. There would still be time for Marty to contribute to Halo 5, but I am starting to doubt it sadly :( I loved "117" and some other pieces from Halo 4, but the ancient, epic, universe-shattering feelings I got from Marty from pieces in Halo 1 - 3 were not quite there in Halo 4. Although "Attonement" was amazing also. I literally listened to it on the title screen for 2 or 3 minutes before I started playing the campaign the first time because it was so amazing and inspiring. I wish Davidge and Marty would team up for the remaining Halo games much like Marty worked with Salvitori on Bungie's Halo games.