Where can i find that beautiful afghani/iraqi (middle eastern)music that plays in all those war doentaries?

If you look at the end credits, they always tell you whom the music is produce by. There are only three people i am aware of that makes music for these films Hans Zimmer, James Horner, and John Barry. I own pretty much all of those soundtracks. Now you can also go to Amazon and type in the movie and find out the composers..