Interesting article!
Ayu's voice is really unique in her own right which is one of the reason why I love her. She uses her nasal voice when singing and captivates the listeners. Her voice can be so painful in the ears (I always experience it especially with earphones), but this is just so perfectly imperfect that makes her standout.
I haven't use the throat-singing until I heard of Ayu. For me, it's really hard because as you said, it can damage your vocal chords but for me when I use this technique, I can hit the higher notes (in Ayu's songs case). But I just do this when it's in need.
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