This video is of Jean Gnonlonfoun playing Kosso, a polyrhythm, talking drum piece. It started out with a simple beat, with him playing the drum with a hitting stick and his hand. The piece then gradually picks up, and he adds in recordings of 4 other rhythms to make a 5 rhythm polyrhythmic piece. The piece ends somewhat abruptly with the first recording laying 3 quick notes down. I enjoyed how he could change up the beat but keep up with the same rhythm, staying true to the rest of the recordings and not getting lost in the beat. 

I found the video on Youtube: