Delta Halo Suite

 Delta Halo Suite is a suite of songs included in the Halo 2: Original Soundtrack. It includes Penance, Wage, Leonidas, and Dust and Bones.

The Delta Halo Suite plays mainly during the levels Delta Halo and Regret.

It runs for 11:26. It features the recurring "Delta Halo Theme", which also appears in Peril, Sacred Icon Suite, and the last movement of Brutes (Music) in the Halo 3 Original Soundtrack].

Penance combines the Delta Halo melody with the beat of Heretic, Hero. It is played during the intro cutscene to Delta Halo, when the Master Chief and the ODSTs are dropped from In Amber Clad.

Wage is an Under Cover of Night remake, though it is on strings and more in the background when it plays. It is heard during the cutscene at the beginning of Regret. The drumroll from this part is played at the beginning of the level Cairo Station. The chants from The Maw/Remembrance are also heard in the latter part.

Leonidas is based on On a Pale Horse from the Halo: Original Soundtrack, and is played in a similar situation where Banshees and other aerial enemies attack.

Dust And Bones is an orchestral version of Heavy Price Paid from Volume 1. The name may be a reference to Dust and Echoes from the Halo: Original Soundtrack.

It's the longest suite in the Halo 2: Original Soundtrack, and the longest in all of the soundtracks from Halo: Combat Evolved to Halo 3.

Trivia

 * Leonidas, the name of a section of music, is a reference to the famous king of Sparta, who led his troops at the Battle of Thermopylae.