From the press release:

    Today, 2K Games released the original score to BioShock as a free download on The Cult of Rapture website. The score was created by film, television and video game composer Garry Schyman and features a combination of early twentieth century writing, aleatoric elements, musique concrete, traditional tonal and late romantic styles that capture the distinct retro-futuristic aesthetic of the game. To download the score for free, please visit The Cult of Rapture at: http://www.2kgames.com/cultofrapture.