I can to divide this question in some parts:
1. Gregorian live instrumentalists;
2. choir members of 2000 & 2003 tours;
3. french bonus choir members and singers from "Voyage voyage" video;
4. choir members and dancers from dvd "Masters of Chant in Santiago de Compostela";
5. choir members from dvd "Moments of Peace in Ireland";
6. choir members from dvd "Masters of Chant chapter 3";
7. choir members from 1996 - 2008 tours;
8. choir members from TV shows;
9. orchestra from TV "Music for millionen' (song "Bridge over troubled water").
Today - first question about instrumentalists:
1. What full name have black drummer (Robby from Trinidad), who played drums in Christmas tour with Carolina Fortenbacher? (seen on a fotos of Flensburg & Leipzig 2008 concerts etc.)
2. What name have new guitarist, who played guitar in this same tour? (seen in a two fotos of Leipzig 2008 concert)
3. What name have drummer, who played drums in Calwer 2008 concert? I think, he is not Kristian Draude.

4. Who stay on a first keyboard in 2003 tour? On a second keyboards is Jan-Eric Kohrs, I think. But who is on left side? Maybe Amelia Brightman?

5. Guitarist in the same tour is Gunther Laudahn?

I think, drums played Roland Peil in this tour.
6. Who know all violin players in Kreuzenstein concert? (Particular violin players in a second and third row):
3-rd: 0 0
2-nd: 0 0
1-st: 0 0 0 0 0 0.
Right side violiners of 2-nd and 3-rd rows can not seen so good in the video.