How do you use as3 to play and access your iPhone music library?

Hi, i’m making an app that i’d like to play random music in the background. Instead of loading up a pile of songs i have been trying to work out how to make the app read and play songs from your own iphone music library but i just can’t find any information anywhere on this. If i’m honest i don’t even know where the file (i’m guessing it’s an xml file) is actually stored on the Iphone. Can anyone please help?