
The overtone itself isn’t Intresting, what you do in your throat and mouth to get there is - g
I disagree, there is profound truth in an well played overtone.
No one can sing the upper partials, anyway. For me, beginner or not, I sense the lip pressure and positioning is as important as the cavity. Once one of the overtones is stable, you can mess with the shape of the throat and the placement of the tongue and it shows the effects. Ironically, I am now hitting the fifth (two octaves up), but still not getting the fourth partial. I do hear it in there, though.
I'm won't be buying any of her records but that is amazing.
In my post I indicated that the throat muscles are in fact involuntary. It's not possible to consciously control them.Overtones on the Saxophone are created in the oral cavity and the throat (and in other areas). In fact not only the overtones, all tones are created with the use of the oral cavity and throat. Look at these pictures:

