"The lady starts singing "Aaahhhh ahhh ahhh" or "daah daah daah" in a high pitch in tune to a beat, which then starts to rise & fall in tune to "the lady"'s singing of "Aaahhhh ahhh ahhh" or "daah daah daah"
http://www.youtube.com/watch?v=gwG8WXYAHR0
tbh
