Halo: Reach is a 2010 first-person shooter developed by Bungie and published by Microsoft Game Studios, originally for the Xbox 360. The fifth installment in the Halo series and a direct prequel to Halo: Combat Evolved, Reach was released worldwide in September 2010. The game takes place in the year 2552, where humanity is locked in a war with the alien Covenant. Players control Noble Six, a member of an elite supersoldier squad, when the human world known as Reach falls under Covenant attack.

After releasing Halo 3 in 2007, Bungie split into teams to develop two different games—what would become Halo 3: ODST and Reach. The developers decided to create a prequel to the original Halo game trilogy, freeing themselves from the obligation of addressing old story threads. As the game would take place on a human world doomed to be destroyed, they focused on making the environment a character unto itself. Longtime Halo composers Martin O'Donnell and Michael Salvatori returned to compose Reach's music, aiming for a more somber sound to match the story.