At long last, here's the multimedia photo essay on the Gnawa (or Gnaoua) Festival in Essaouira, which includes photographs made in situ during performances and processions. It includes audio clips of live recordings, as well as a short interview with a master "maalem".
Just click on the above photograph or here. This will open a new window and automatically start the multimedia slideshow, so if at work, you'll need to turn down the volume of your speakers.
I originally planned to have this posted in a few days, but the multimedia slideshow was recently "leaked" on Twitter...so as it's out there already, it also ought to be on TTP blog!