O'Donnell stated his main influences were music he liked-'a little Samuel Barber meets Giorgio Moroder'.

O'Donnell was nervous about the project, saying he approached it, 'with fear and trepidation'. He had scored previous Bungie projects, including Myth: The Fallen Lords, while working for his audio company, TotalAudio, along with Michael Salvatori. A special edition of the soundtrack was released on October 28, 2003, featuring a DVD with a trailer, demo movie, and high quality music for Halo 2.Īs the audio director for Bungie, Martin O'Donnell was tasked with writing the music for Halo: Combat Evolved. Some complimented the wide range of musical styles, and most agreed that playing the game is not required to enjoy the soundtrack. Upon release, the soundtrack was well received by critics. The soundtrack features a wide range of musical styles, including chanting, string orchestra, and percussion.

The first piece O'Donnell wrote, known as 'Halo', became the basis for Halo 's 'signature sound' which has been heard in the other games of the main trilogy. Most of the music from Halo: Combat Evolved is present on the CD, although some songs have been remixed by O'Donnell in medley form for 'more enjoyable' listening. Composed and produced by Martin O'Donnell and Michael Salvatori for Bungie, the soundtrack was released on June 11, 2002.

The Halo Original Soundtrack is a soundtrack for the video game Halo: Combat Evolved.

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