I went for a coffee with a friend after classes yesterday. She converted to Islam some time ago and told me about muslim hiphop in german - something I never even knew existed. The band she was so fascinted from is called "ammar114" and all of their songs are freely downloadable. I just tried, but their website seems to be down currently. Anyway, I found a link to a songtext (Schwester) and some of their songs are free for download here.