GameDynamo - "Like other games in the series, Call of Duty: Ghosts has lots of extra intel for you to discover in each mission. This time, there are 18 pieces total, all related to Rorke. Every mission has one file to find, and getting them all will grant you the “Audiophile” trophy or achievement. Want to find them to get the 100% completion of the game? Use our guide to learn the locations of all 18 files."