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The music of Halo: Combat Evolved is the musical score to Halo: Combat Evolved.

Development
The composition of the soundtrack for Halo began with the Halo Theme in July of 1999. The music was composed by Martin O'Donnell and Michael Salvatori, who were co-partners in the freelance production company TotalAudio. Together they had composed commercial jingles as well as music for past Bungie games, including Myth: The Fallen Lords, Myth II, and Oni. In 1999, O'Donnell and Salvatori were asked by Director of Cinematics Joseph Staten to compose a backing track for the Halo MacWorld demo, five days prior to the presentation. Staten told O'Donnell that the theme needed to evoke the game's "ancient, epic and mysterious" atmosphere. To best convey this impression, O'Donnell drew inspiration from his studies on Middle Ages music and incorporated Gregorian chant into the theme. The theme was also influenced by the first verse of The Beatles' song "Yesterday", which inspired the four-phrase structure of the Gregorian chant. O'Donnell has stated that he laid down the core melody of the theme in about half an hour during the drive to the studio at Salvatori’s house. Recording one day prior to the MacWorld presentation, the theme was recorded with an orchestra composed of six string instruments: four violins and two cellos. The theme has since become a staple of the series.

Following the presentation at MacWorld, Microsoft purchased Bungie in May 2000, and the platform for Halo moved from the PC/Mac to the Xbox. O'Donnell and Salvatori encountered some obstacles in the project, having to take into account the music implementation system on the audio specifications of the Xbox. O'Donnell and Salvatori completed the rest of the soundtrack over the course of 2001, with the time period between Juy and September being a "hellish blur". O'Donnel described the style as "a little Samuel Barber meets Giorgio Moroder". O'Donnell, having joined Bungie before Microsoft's acquisition to work on Oni and Halo, moved to Seattle with the rest of Bungie, while Salvatori remained at Chicago to run TotalAudio. The two sent their music to each other for feedback and suggestions. Different aspects of the Halo Theme, including the Gregorian chant and string melody, were adapted into other musical pieces in the game.

During the production, O'Donnell and Salvatori had purchased new equipment after a fire burnt down their studio in 1999, with benefits like producing the music in 5.1 Surround Sound and making digital, hard disk based recordings. The composers also made use of patches and samples from their instruments, including the Proteus 2000 and the Kurzweil K2500X synthesizers. The music used MIDI recordings, featuring keyboards, synths, and samplers as well as digital recording equipment controlled by computers. Certain tracks featured live instrumental performances alongside the MIDI recordings, while other tracks only adapted the live performance. The music was cut and edited into chunks, so that the audio engine played interactive music dynamically based on the player's actions.

O'Donnell and Salvatori worked closely with the level designers, learning to match the audio design to where the different points of tension and release within each level - if the designers did not think the music fit, O'Donnell made some changes according to their feedback. While working with the level designer of Assault on the Control Room, O’Donnell added an Easter egg, in which players could listen to Siege of Madrigal - a track from the Myth: The Fallen Lords - if they reached the top of the control room structure in the level. Siege of Madrigal was then featured in the official soundtrack as a bonus track following the Halo Theme. At one point in development, Director of Cinematics Joseph Staten wanted to license and play "Paint it Black" by the Rolling Stones in the mid-level cinematic of 343 Guilty Spark, during the Pelican ride with Sergeant Johnson and the Marines. In the end, however, Shreddin' from the Bungie’s previous game Marathon: Durandal was used instead.

Several musical pieces did not pass the their initial sketch phase, while other alternate versions of released tracks were cut rom release. These tracks were later released on Bungie.net:
 * Halo Love Theme Sketch
 * Rhythm Sketch Variant
 * String Sketch
 * Fast Sketch
 * Battle Sketch - An early version of Brother in Arms
 * Club
 * Seriously
 * What?
 * Tron

Release
Martin O'Donnell and Michael Salvatori adapted the motifs from Halo Theme into various tracks in Halo: Combat Evolved, and continued to do so when composing other Halo music. As a composition approach to create what O’Donnell refers to as “emotional equity”, a sense of familiarity would be felt by players when themes are being repurposed, remixed, and reused throughout the trilogy. This would become a tradition followed by future composers in the franchise; for example, the space theme from ‘’Opening Suite’’ would appear in Halo 2, Halo Legends, Halo: Reach, Halo 4, and Halo 5: Guardians, all of which had the theme accompany a scene set in outer space.

The iconic Halo Theme would then appear in every piece of Halo media. While only a few tracks other than the Halo Theme were given new renditions in Halo 2, many more pieces reappeared in Halo 3. The entire Halo: Combat Evolved soundtrack was arranged and orchestrated for the remastered release of Halo: Combat Evolved Anniversary.

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Musicians

 * Martin O'Donnell
 * Michael Salvatori
 * Harry Hmura
 * Arnold Roth
 * Peter Labella
 * Everett Zlatoff-Mirsky
 * Elliott Golub
 * Nisanne Howell
 * Marylou Johnston
 * Kevin Case
 * Barbara Haffner
 * Larry Glazier
 * Judy Stone

Singers

 * Martin O'Donnell
 * Michael Salvatori
 * Robert Bowker
 * Jeffrey Morrow
 * Rob Trow

Myth: Total Soundtrack
In 1999, the Myth: Total Soundtrack was released. Although the album was released as a compilation of the soundtracks of Myth: The Fallen Lords and Myth II: Soulblighter, the fortieth and final bonus track in the album was the Halo Theme from the E3 1999 trailer.

2002 Release
In an interview held after the release of the Halo E3 2000 trailer, Martin O'Donnell expressed interest in the soundtrack being sold. After the game's release, O'Donnell was approached by Nile Rodgers who founded the recording label Sumthing Else Music Works for distributing video game soundtracks. The official soundtrack featured all of the music from the game, except for the track that would be known as Lost Muse, which was later released on Bungie.net with music cut from the game.

2003 Special Edition
After the Halo 2 E3 demo, a special edition of the soundtrack was released with bonus features on the Halo 2 demo, including previews of two Halo 2 soundtracks, The Last Spartan and Ghosts of Reach.

Halo Trilogy: The Complete Original Soundtracks
In 2008, after the release of Halo 3, a box set was released, featuring the Halo: Original Soundtrack, the Halo 2: Original Soundtrack, Volume 2, and the Halo 3: Original Soundtrack.