Screen shots of the relevant sections:
Here's a video of excerpts from "Nana et Lila." It looks and sounds quite remarkable. Damn it, I was at the 1992 Avignon festival, missed it by one year! The Gnawa who perform are Gnawa Halwa from Marrakesh, led by the terrific singer and guinbri player, the late Abdenbi Binizi, who I had the privilege of meeting in Morocco in 1999.
Nana et Lila from Blanca Li on Vimeo.
Here's a video clip of Abdenbi performing by himself:
And a photo of him with Gnawa Halwa.