Kinda got a bounce.  This was from the 2nd album after adiemus (british airways commercial back in the day).. I may be wrong but I dont think the vocalist are singing any known words..or its like a mixture of language.  I may be thinking of Adiemus though.  Something else I could have confused, but I think she is the vocalist on the "Now we are free" track on the gladiator soundtrack.  probably need to fact check that.  anyway..happy sounding little song