Phonetics students occasionally ask me about overtone singing (throat singing). I know phonetics & acoustics, but not music. This video is an excellent overview, complete with spectrogram:

Visionner « Polyphonic Overtones MADNESS! Opera Singer breaks down how through software! » sur YouTube
https://youtu.be/Y6UNKYkKz74

Hope I remember this next time someone asks!

#PhoneticsNerdery
#OvertoneSinging
#ThroatSinging