Vast numbers available here
Some more sound files from the 2007 Sacred Music Colloquium:
Last evening, the full colloquium choir gathered at St. Mary’s in Washington, D.C. for a Missa Cantata said according to the Roman Missal of 1962. Sound files to be posted in the next day.
The chamber choir from the Colloquium, singing O Nata lux, by Thomas Tallis.
Here is the Kyrie from Missa O Quam Gloriosum, by Victoria