I'm not moving this to Myspace Support, seeing as it's a
graphic related question.
You probably won't be able to duplicate that exactly, but deffinately look into some tutorials on making banners/headers. I have a huge list of livejournal banner tutorials saved on AOL, so I'll edit that link in a little later.
The Kanye West one just looked like text placed on a black background (to match the background of the rest of the image).
And this code might be helpful
http://www.createblog.com/scripts/script.php?id=457