Finish the Fight
From Halopedia, the Halo wiki
This article is about the Halo 3 soundtrack. For the ViDoc, see Halo 3 ViDoc: Finish the Fight. For the teaser for Halo: The Master Chief Collection, see Finish The Fight. For the achievement, see Finished the Fight.
The piece begins with a piano chord of eighths. Choir joins in with a soft melody, then piano plays another, louder chord. Choir then "replies" with another louder variation of their melody. Piano plays again, then orchestra joins in, swelling louder and louder. Suddenly, it quiets again for a fanfare with a five-note E Dorian melody in piano.
Strings then repeat the motif, reverting to Halo Theme's triplet melody of strings, choir, and brass that is centered around the chord of E Minor. This section is more of a "multi-melody", where each instrument has their own melody. The result is an extremely complex binding of all the melodies together. At the end, brass and strings play the piano theme again while the choir joins the harmony. All of instruments then play the five-note E Dorian melody triumphantly before swelling to a climatic ending.
While Finish the Fight was reinterpreted into This is the Hour to match the in-game cutscene, the five-note E Dorian fanfare was adopted by various musical instruments in different instances of Halo 3, and made appearances in the following tracks: