Are you saying that the recording was of a group that was sight-reading Tavener? If so, that's an extraordinarily good chorus.
Do you have a special interest in Tavener and other composers of the Tudor era, or were you just struck by the video clip of Diana's funeral?
Oh, the way the video is allows one to read the sheet music as we did in choir practice and in performance.
Other choirs required us to sing without sheet music.
This video allows those who watch it to know what people in the choir see.
This Tavener isn't of the Tudor era. I remember when I went to Barnes & Noble once to find more music by Tavener, I saw the Tavener you're speaking about. No, the Tavener of this composition died, I think within the last one or two years.
I did eventually get a CD of the modern Tavener.