Something interesting here! These are clearly Orthodox (Byzantine?) chants - yet this video is labeled: Service of Matins, 2008 February 4: Monday, 12:00 AM, Concordia University Wisconsin, Rogate Chapel. Hmmm.
Well, I like these chants anyway, so here's the video; there are several that follow this one. Will try to find out more about what this is about.
Love that Venite!