An interesting YouTube video has been going the rounds recently, marrying a choral performance of a song with laryngoscopic shots of the singers’ glottises.
See each glottis opening, closing, and vibrating! Admire those arytenoids! Marvel how the epiglottis swings back and forth, sometimes obscuring the view of the vocal folds!
Once upon a time (such as when I was a postgraduate) there were only rare and specialized occasions to view a laryngosocopic film clip and view the vocal folds directly. Now here it is for everyone to enjoy (if that is the word).
I think we have to take it on trust that the film clips are properly synchronized with the sound.
I don’t know anything about “the all-girl vocal group Kaya” — does anyone? I have to say, though, that when they sing lips it sounds remarkably like leaps liːps. It must be because they’re Australian, with raised KIT (and diphthongal FLEECE).
Thanks, anyhow, Australian colleagues.