[Flash 9 is required to listen to audio.]
Adiemus - Adiemus
“There are no lyrics…instead the vocalists sing syllables and ‘words’ invented by Jenkins. However, rather than creating musical interest from patterns of phonemes (as in scat singing, or in numerous classical and crossover compositions), the language of Adiemus is carefully stylised so as not to distract the listener’s attention from the pitch and timbre of the voice. Syllables rarely end in consonants, for example…The core concept of Adiemus is that the voice should be allowed to function as nothing more than an instrument.”
-Wikipedia