It is the arguably the most iconic piece of music that Bungie has produced, and it is the song that comes to mind when I think about the Halo series. Truth and Reconciliation Suite is actually a collections of songs from Halo: Combat Evolved mashed together, but the real gem starts around the 1:50 mark:

The driving beat of the drums is eventually accompanied by a set of strings that propel the player forward. It is a forceful rhythm, urging us to press on and make headway, which is exactly what you need to hear when you start levels like The Silent Cartographer, where there is a massive enemy front waiting for you. This section of the suite is what will carry you through the fight, giving you the push you need to overcome the Covenant’s defenses. The rest of the compilation is standard sci-fi/horror fare with lots of synths and creeping bass, but from 1:50 to 4:30, you hear the essence of the Halo series: an unrelenting force marching upward.

This clip is heard throughout the series. For instance, it reappears in Halo 2's start up menu if you stay there for a while. Halo 3 has it more prominently, though, as it is the basis for the tracks One Final Effort and Finish The Fight. In these two renditions, the song is less synthy and more orchestral than it was in the first game, giving it a more weighty air to it, adding a layer of seriousness. Halo 3 was probably seen at the time as a close for the series, so it made sense that the composers, Martin O’Donnell and Michael Salvatori, made it more mature sounding so it could be a proper sendoff. The piano found on both tracks fuels this notion of finality, hammering home with each note that this is the end, and it is time to go out in a blaze of glory.

This section of Truth and Reconciliation Suite is the heart and soul of Halo, embodying what the Master Chief was designed to be: something that pushes through the onslaught, marching uphill through adversity, and winning the day at the end of it all. The haunting choir of Opening Suite in the first game gives players a sense of awe and wonder when they first start, but it Truth and Reconciliation Suite that makes the game worthwhile and keeps us playing.