[zengid]

If anyone likes overtone singing mixed with western styles definitely check out Toby Twining [0]. You can hear the overtone singing in the voice saying "reee", since that allows a rich-enough tone to produce strong overtones that can then be 'focused' by changing the embouchure (a term I'm borrowing from wind instrumentalists to describe the positions of the lips, tongue, teeth and facial muscles [1]).

[0] https://www.youtube.com/watch?v=NHtadMpziY8

[1] https://en.wikipedia.org/wiki/Embouchure

[zengid]

Toby was a student of Ben Johnston, who was a pioneer of combining Western Classical and American Folk music with Just Intonation. https://www.youtube.com/watch?v=_9p9L5i0MGo