Heavy synths colliding with orchestral grief, like the series finally admitted it had feelings. Halo 4's standard soundtrack is fifteen tracks composed by Neil Davidge and Kazuma Jinnouchi, marking the first Halo score without Martin O'Donnell at the helm.
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"Awakening" opens with this electronic pulse that immediately tells you something changed. "117" is the emotional core of the entire game, a slow build that connects Master Chief's identity to a single piano line before the orchestra swallows it whole.
"Green And Blue" closes things out with vocals that make the Chief and Cortana relationship hit on a level the gameplay never quite reached. "Requiem" brings the alien grandeur, big and strange and full of reverb. "To Galaxy" pushes into almost ambient territory.
Start here if you want to understand why people argue about whether Halo 4 has the best score in the series.