At the beginning of the Sioux Grass Dance you can here the drums being played and keeping a strong pulse and what I believe is a duple meter. I can hear suspension rattles, container rattles and drums. The male and female voices are in unison with some call and response. The use of vocables is very present, their voice are high and falsetto is defenitily used. Almost each phase of their chant is in high pitch when they begin and it starts descending by small intervals, and then jumps to the next "phrase" loud again.