Christopher Lennertz and Timothy Wynn both worked on the soundtrack, which was performed by the Slovak Radio Symphony Orchestra. The duo ended up recording over 100 minutes of music over the course of a 6-day period.
Adding such a symphonic score is no easy task, and the team at Incognito had to create a suitable way of applying the music to the gameplay experience. According to a 1UP report, it appears that the music is triggered by the amount of enemy fire near the player. "If a certain threshold of enemy gunfire is met, the combat music starts to play." Listen to samples of the soundtrack before its release at 1UP.