ABOUT THE DLC This content requires the base game. Songs of the Caliph contains two new songs, totaling 11 minutes. Composed by the talented Andreas Waldetoft, these songs are used while playing as Muslim rulers in the Sword of Islam expansion.Song Tracks: Saladin Arrives at Jerusalem The Persian Army Read more What are the system requirements? WINDOWS OSWindows7 Processor Intel Pentium IV 2.4 GHz or AMD 3500+ Memory 4 GB RAM GraphicsNVIDIA® GeForce 8800 or ATI Radeon® X1900, 512mb graphics memory required. Storage2 GB available space Mac OS X OSMac OS X 10.6.8 or later Pro