Greatest Journey
From Halopedia, the Halo wiki
Greatest Journey is a song included in the Halo 3: Original Soundtrack. It plays during the level Halo.
The song starts with a slow choir-and-strings melody, almost the same as the begining of Halo Reborn, but with a strings melody. The vibrato used by the strings section is very prominent in this section. It is similar to the song Shadows. The motif continues, and at 0:55 seconds, changes to a more gloomy and strange tone. This continues until 1:41 seconds, when drums start beating. This leads to the start of the Halo 3-version of the Halo Theme from the Halo 3 E3 2007 Trailer. This could be considered the "turning point" of the song. In game, the song loops between three sections: the beginning of the Halo theme, the violin section of the theme and the piano section from Three Gates. It then transits to a version of One Final Effort's second half, reinforced with choir. At 4:30 seconds, the Halo Theme section ends, and high strings and piano play the last notes.
The song might refer to Johnson, who dies during the level.
It runs for 4:57 seconds.
Note: The name of the song could refer to the Great Journey, and also death, which is the "Greatest Journey" of life. Template:Halo Music