Wow, you should listen to him: http://www.bbc.co.uk/radio3/worldmusic/a4wm2006/a4wm_zahoor.shtml This guys music is out of this world! I just can't get over it. I thought I'd never hear this kind of beautiful Sufi love poetry of Quwaali.
Yes, I am also a big fan of Qawali. Have you heard of the famous Ustad Nusrat Fateh Ali Khan, he is the best Qawaal in the history of the world. Peace.