Suite Autumn

Suite Autumn is the twenty-third track included in the Halo: Original Soundtrack as a suite/medley of four short music pieces.

Overview
The tone is somber, and somewhat ominous. The tone adds to an atmosphere of uncertainty. The soundtrack is composed of four sections. The first section (0:00-0:48) begins with low notes which only lasts a few seconds before being cut out abruptly by high strings, creating a suspenseful feeling. The second section (0:49-1:27) enters with two-part low strings playing in ambiance. The third section (1:28-3:01) cuts in with a two-part high vocals, followed by high notes in the background, echoing the rendition of the Halo Theme Gregorian chant from the earlier track Enough Dead Heroes. The fourth section (3:02-4:22) features low strings and vocals in a somber ambiance piece.

The piece was fully reorchestrated into Suite Fall in the Halo: Combat Evolved Anniversary Original Soundtrack.

Appearances
The soundtrack can be heard:
 * In the level Pillar of Autumn (0:49-1:27) after Jacob Keyes handed the M6D Magnum to John-117 on the bridge of.
 * In the level Halo (0:00-0:48), at the beginning when John-117 exits the SKT-9 Bumblebee Lima Foxtrot Alpha 43.
 * In the level 343 Guilty Spark, when Echo 419 dropped John-117 at the swamps (3:02-4:22), when John-117 approaches the room where members of Fire Team Charlie encountered the Flood (3:02-4:22), and as John-117 approaches the light bridge leading to the elevator which would bring him to the surface of the Flood containment facility. (1:28-3:01)
 * In the level Two Betrayals, briefly in the opening cutscene when 343 Guilty Spark begins to threaten John-117 (3:02-4:22), when Cortana explains the method of disrupting the phase pulse generator at the first generator (0:00-0:48)and after John-117 disrupted the second phase pulse generator (0:00-0:48).
 * In the level Keyes, after John-117 punched the Proto-Gravemind to acquire Keyes' neural implants (1:28-3:01).
 * In the level The Maw after his arrival via Banshee (3:02-4:22), and after John-117 destroys the third fusion reactor (1:28-3:01).

Production notes
The title of the track alludes to and is a play on "Sweet Autumn," which is the name of a flowering plant.