Choral Public Domain Library

Can anyone identify the Kyrie in this video? Warning: the visuals show a scope going through 4 singers' noses to show their vocal cords).
http://www.youtube.com/watch?v=4GtbnZnwpQA

While we're on the subject, a similar video about vocal nodules:
http://www.youtube.com/watch?v=z9LKwISwb_c

Kyrie of the mass "O magnum mysterium" by Victoria.

Thanks!