BioShock's licensed soundtrack helped contribute to the immersive atmosphere of the game with real world licensed music reminiscent of Rapture's time period. Most of the selections came from the mid-Twentieth Century and cast a feeling of the past in the ruins of the fallen utopia. Several other songs have been licensed without appearing in-game, though some are still present in the game's files, and two more were added for the release of the game on PlayStation 3 systems. Also, three modern tracks were recorded by Moby and Oscar the Punk for The BioShock EP album included in BioShock's Limited Collector's Edition released in August 21, 2007.