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During my last visit to Senegal, I managed to hear Khadim Gueye, probably the most well-known Mouride sufi singer of the last few years, perform for a small audience in Touba, and I had the microphone on. More information on him, and on this type of music in general can be found here.
http://blogs.voanews.com/music-time-in-africa/2008/09/23/sufi-sounds-volume-two/