Have you listened to isolated vocals? Its different sounding without music, if so post a link.
I based my comment off of these analyses:
https://www.youtube.com/watch?v=HWB96ZLWUUw
https://www.youtube.com/watch?v=rfdh9x743Vw
The first video may be more applicable to your question.
What an incredible voice.
A modern day Siren. Well in her days.
https://www.youtube.com/watch?v=SAwS8Denybc
And if this hippy would just shut up
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