 Marty O 'Donnell again composed the original score for the game . Some pieces of the game 's music are produced with a much larger real orchestra than any pieces in the prior two games . For example , the music for the announcement trailer was recorded with a 60 @-@ piece orchestra and a 24 @-@ piece choir . Halo 3 is the first game in the series to feature custom soundtracks , allowing players to replace in @-@ game music with their own choices . The Halo 3 Original Soundtrack was released on November 20 , 2007 . Included on the soundtrack is an original composition submitted by fans and judged by Nile Rodgers , Michael Ostin , and Marty O 'Donnell . 
