Yes , you are right - you should have a internal server in which you can post your audio file to server & get a return string of path that contains the media file - just post that link to Facebook using Graphh API Links , then if a user clicks that link which is media file url like http://yourserver.com/myaudio.mp3 - fb will play that media files.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.