Yesterday, I heard on NPR a few songs by a professional violinist that sounded extremely shrill, something like a glass harmonica, which I thought it was. I missed the beginning of the show and didn't understand what was going on, except that the composer of the pieces are very contemporary. I believe the musician called her instrument a Baroque Violin. How is such a sound made?
Harmonics can sound like a glass harmonica; they are subtle, ethereal sounds. Check out Fiddlerman's brief tutorial video on violin harmonics to see if you recognise any of the sounds (they're quite varied):
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