Halo 2 Original Soundtrack

The Halo 2 Original Soundtrack is the soundtrack for Bungie's 2004 video game Halo 2. The soundtrack was released as two separate volumes, released almost two years apart. Volume 1, released at the same time as Halo 2 on November 9, 2004, contains arranged instrumental pieces written by Martin O'Donnell and his partner Michael Salvatori, as well as "inspired by" tracks from bands Incubus, Hoobastank and Breaking Benjamin. Volume 2 was released on April 25, 2006 and contains all the game music arranged in a suite form.

O'Donnell, who had previously composed the music for Bungie games such as Myth and Halo: Combat Evolved, sought to develop the "Halo sound" of the previous game as well as introduce new sounds and influences to the music. The music was based on what was happening in the game, rather than using leitmotifs or theme repetitively. The music was recorded in pieces with a fifty-piece orchestra at Studio X in Seattle, Washington. To mark its release both Microsoft and Sumthing Else Music Works planned an aggressive marketing campaign.

Upon release, the music of Halo 2 was well received. Critics were split on the merits of Volume 1, with some publications enjoying the bonus offerings while others felt the first volume lacked cohesion. Volume 2 was declared the "real" soundtrack to Halo 2. Upon release both soundtracks became commercial successes, with more than 100,000 copies sold. The soundtracks' success was pointed to as a sign of increasing legitimacy of video game music in the entertainment industry. Halo's music has since been played in concert settings, including Play! A Video Game Symphony and Video Games Live.