Edge Closer
From Halopedia, the Halo wiki
Edge Closer is a song included in the Halo 3: Original Soundtrack. It plays during the level The Ark.
It starts with a gloomy melody, almost reminiscient to the music played when facing the Flood in Halo 2. At around 0:40, the music quickens to a rapid drums (?) beat. Later on, a soft melody is added to the background. At 2:10, choir starts a major melody, with drums and orchestral accompaniment. Near the end, the drums get dramatically louder, and the song fades to a close.
It runs for 3:01.
