Finish the Fight
From Halopedia, the Halo wiki
This article is about the Halo 3 soundtrack. For other uses of "Finish the Fight", see Finish the Fight (disambiguation).
The piece begins with a piano chord of eighths. Choir joins in with a soft melody, then piano plays another, louder chord. The choir then "replies" with another louder variation of their melody. The piano plays again, then the 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 instruments then play the five-note E Dorian melody triumphantly before swelling to a climatic ending.
While Finish the Fight was arranged 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:
The fanfare has since appeared in every mainline game in the series following Halo 3. The fanfare's melody first briefly appeared in Old Friend (in Finale from Halo 3: ODST Original Soundtrack). The melody then appeared in Say the Words (in The Package from Halo: Reach Original Soundtrack) as a reprise of Keep What You Steal. 343 Industries' composer Kazuma Jinnouchi then incorporated brief reprises of the melody in the tracks Atonement (from Halo 4: Original Soundtrack) and Blue Team (from Halo 5: Guardians Original Soundtrack). These were followed by the full fanfare being featured prominently in the Halo Infinite announcement trailer as well as the pre-release track Set a Fire in Your Heart.