 The soundtracks feature "frozen" arrangements that represent an approximation of a play-through of the games.The "Halo Original Soundtrack" sold over 40,000 copies, and was followed by two different releases of the music to "Halo 2".The two volumes of the "Halo 2 Original Soundtrack" were produced by Nile Rodgers, with the first album being released in sync with the video game in 2004 and became the best-selling game soundtrack of all time.