One Final Effort
From Halopedia, the Halo wiki
One Final Effort is a song included in the Halo 3: Original Soundtrack. It's heard on the level The Covenant when you face the two Scarabs.
It starts with a piano playing the theme from This is the Hour. It then switches to the music from the Halo 3 version of the Halo Theme. The end is a soft strings(?) melody that fades to a close.
It runs for 3:08.
