Had received it from a member of the audience who had flown all the way from Québec to New York for the show. When he returned to Québec he had Googled the concert and found this blog, after which he contacted me to ask about the experience. Have not spoken to him in a while, but apparently this very avid fan surfs YouTube religiously to look for new videos and was nice enough to send this to me. And from the looks of this one, it might have been professionally recorded, which completely counters what the choir was led to believe about it not having been recorded at all. Hopefully more will appear soon.