I've been fascinated for many years with Tuvan Throat-Singing, particularly the group Huun-Huur-Tu. A few years ago I happened upon a Scientific American article (which I have since misplaced) that enumerated several of the styles.
Khoomei. False-vocal-chord vibration, selecting overtones with a round lip-shape and a soft tongue (Wu, Woah, Wuh, Weh).
Sygyt. Laryngeal vibration, selecting overtones with a tightened throat and a sharply arched tongue (Aaaaa, Iiiiii, Eeeee).
Kargyraa. False-vocal-chord vibration, overtones as with Sygyt.
Does anyone know more than that? (This is the sum of my technical knowledge on throat-singing and it's not enough: I can get about 3, maybe 4 distinct notes with Khoomei; but zero progress on the other two. And often I run out of breath before I can even find the tones.)