Halo: Original Soundtrack is the soundtrack for the video game Halo: Combat Evolved. Composed by Martin O'Donnell and Michael Salvatori, it was released on June 11, 2002. It contains most of the music from Halo: Combat Evolved, with some pieces remixed into medley form. The soundtrack features a wide range of musical styles including chanting, string orchestra, and percussion. A special edition of the soundtrack was released on October 28, 2003, featuring a trailer, demo movie, and music for Halo 2.