The Halo 3 Original Soundtrack is the official soundtrack to Bungie Studios' first-person shooter video game Halo 3. Most of the original music was composed by Martin O'Donnell and Michael Salvatori, but also includes a bonus track, "LvUrFR3NZ", which was the winning entry in a contest held before the soundtrack's release. The 2-CD set was released on November 20, 2007. For the final game in the Halo trilogy, O'Donnell added new themes as well as bringing back and expanding old ones, some of which had never been recorded with a full orchestra before. The score made extensive use of the piano, an instrument which O'Donnell used extensively for composition but which had not been featured in previous Halo music. In addition to scoring the game, the music was used for promotional advertisements and trailers preceding Halo 3's release. Upon release, the soundtrack was generally well-received. The score reached the Billboard 200 chart, and also broke the top twenty best-selling soundtracks and independent albums listings. The score was nominated for X-Play's "Best of 2007" awards, under best original soundtrack.
