Here are a dry and a wet version of a choir singing 5 vowels in unison...
http://mihaisorohan.blogspot.no/2010/10/vowel-ensemble-free-vowel-ensemble.html
 
Now if you want to work for it you can get the individual vowels by themselves. I also extended the range, added a little text box to tell you which vowel they are singing and you have the usual EQ, Reverb and ADSR. But I can't distribute the samples. So you need to the download from the previous link and then Save as... Patch + Samples. then move the wave files into the "Full Choir KS Samples" directory.
http://www.mediafire.com/file/ur57o1xh7zhbg5a/Full_Choir_KS.zip
 

Thanks BC, you da man!!
Will definitely forward this to my buddy and download it meself.
 
Cheers

Glad to help, but note these are for full Kontakt, though they should run 15 minutes in Player.

Just added Soundiron's Olympus Elements and Mercury Elements for Kontakt Player to my arsenal. High quality stuff. And quite easy too.