http://www.phys.unsw.edu.au/jw/speech.html is a generally interesting site.
I esp. found of interest its subpages on the differences in the high pitches sopranos sing:
http://www.phys.unsw.edu.au/jw/soprane.html
http://www.phys.unsw.edu.au/jw/reprints/SopranoNat.pdf
the physics of singing, or "why sopranos are special"
Re: the physics of singing, or "why sopranos are special"
Fascinating reading, and it reflects what I've been learning and hearing over the past 15-20 years. Thanks for the online info! 
Chuck

Chuck
Charles H. Giffen
President of CPDL and
Manager of ChoralWiki
User page • Talk page • Composer page
Early Choral Music? Zephyrus (I sang 12 seasons 1992-2004 with this group).
President of CPDL and
Manager of ChoralWiki
User page • Talk page • Composer page
Early Choral Music? Zephyrus (I sang 12 seasons 1992-2004 with this group).