Three songs from Orchestre Poly-Rythmo de Cotonou:
http://www.youtube.com/watch?v=wzK7ttlR0LQ
http://www.youtube.com/watch?v=aX21YIMBbPI
http://www.youtube.com/watch?v=pHkEyorPru0
There is a compilation of their stuff that was released recently (entitled "The Vodoun Effect", on Analog Africa) and upon first listen, it's excellent.