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200px|right Brothers in Arms is a piece included in the Halo: Original Soundtrack. It is the 3rd piece of the album. It runs for 1 minute and 29 seconds.
The ending of the song appears on the Main Menu of Halo: Combat Evolved and the opening and closing cutscenes of the level Pillar of Autumn.Another place it plays is in the level Halo It also plays Halo whenyou come across Seargent Johnson and his men at the first Forerunner structure with thee Covenants Covenant's last attempt to kill the marines.It also plays twice during the level The Truth and Reconciliation, once outside the ship, and once near the brig where Captain Keyes is being held. It also plays during the ending cutscene. It also plays in the Shuttle bay if all or nearly all of the marines are dead, Cortana will call Echo 419 for reinforcements, after opening the bay the song will play. This song's ending is exactly the same as the opening to the Halo 2 track "Impend".
The first time the song plays is when Master Chief and Cortana abandon the UNSC Pillar of Autumn, and its tone is suitably martial for the situation. It opens with a synthetic drum beat; starting at 00:06, the melody of the piece begins on the flute. At 00:32, the melody segues over to strings, who continue the piece's main motif an octave lower. They are shortly joined by a fanfare on synth organ. At 01:00, the drums fade out, allowing the strings and flute to slow the tempo and bring the piece in for its serene conclusion.
It was remade into Follow our Brothers for Halo 3.