Suite Autumn

Suite Autumn is the twenty-third track in Halo: Original Soundtrack.

Overview
Although the track is a suite/medley of four short music pieces, there is a consistent use of somber, and somewhat ominous, tone throughout, creating 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 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 arranged into Suite Fall in 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, and again before John encounters Covenant coming out of their boarding craft (0:49-1:27).
 * In the level Halo (0:00-0:48), at the beginning when John-117 exits the SKT-9 Bumblebee Lima Foxtrot Alpha 43, also briefly during the cutscene where John-117 activates the bridge in the tunnel (3:02-4:22).
 * In the level The Truth and Reconciliation (0:49-1:27), at the beginning when John and the marines exit a D77-TC Pelican.
 * 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 captain Jacob Keyes screams in pain (0:49-1:27), also after John-117 punches the Proto-Gravemind to acquire Keyes' neural implants (1:28-3:01).
 * In the level The Maw after his arrival via Type-26 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.