Suite Autumn

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

Overview
The tone is somber, and somewhat ominous. The tone adds to an atmosphere of uncertainty, with the Pillar of Autumn's sharp turns sometimes you never know what's around the corner. The soundtrack is composed of four parts. The first part (0:00-0:48) begins with low notes which only lasts for a few seconds before being cut out abruptly by high strings, creating a feeling of uncertainty. The second part (0:49-1:27) enters with two-part low strings. The third part (1:28-3:01) cut in with a two-part high vocals, followed by high notes in the background, echoing the mood of Enough Dead Heroes. The fourth part (3:02-4:22) features low strings and vocals, creating a somber atmosphere.

The piece is 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).

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