Next vid on the sidebar :Simply amazing. I wish she would have talked a bit about how it is done, for example what changes are made in the oral cavity to produce the overtone. This was the first time I have heard the term "overtone scale". You learn something every day.
I'm very aware of multiphonics, what she's doing is beyond what I've heard people do on horn with 'em. I've yet to hear someone do counter point like she's doing.Yes, multiphonics can be played on the saxophone. The effect is far different from that of the singer in the video.