Halo 5: Guardians Original Soundtrack
From Halopedia, the Halo wiki
The Halo 5: Guardians Original Soundtrack is the musical score to Halo 5: Guardians. It was released on October 30, 2015, three days after the release of the game. It was available for pre-order on Amazon and iTunes, and can be heard for free in full on 343 Industries' SoundCloud account. Five tracks (Halo Canticles, Light is Green, Kamchatka, The Trials, and Osiris Suite, Act 1) are made available on iTunes after pre-ordering. Several tracks from the soundtrack were later reused in various levels of Halo: Fireteam Raven.
In June 2014, Kazuma Jinnouchi was confirmed to compose the score for Halo 5: Guardians. In 2015, choir recordings for six of the tracks, including Halo Canticles, were done with a 30-person choir at the Rudolfinum in Prague, Czech Republic. Orchestral music was recorded with sixteen microphones at Abbey Road Studios over the course of five trips. Halo 5: Guardians soundtrack incorporates motifs from previous games, including Opening Suite from Halo: Original Soundtrack, One Final Effort from Halo 3: Original Soundtrack, and 117 from Halo 4: Original Soundtrack.
During the Halo 5: Guardians Multiplayer Beta, 25 minutes of the soundtrack was leaked from the beta to the internet. An official statement from Microsoft indicated disapproval of the music leaks, but no legal action was taken.