Marco Hietala, Tuomas Holopainen, Emppu Vuorinen, Floor Jansen, Andy Findon, Frank Ricotti, Dermot Crehan, Nicholas Bucknall, Troy Donockley, Kai Hahto, Metro Voices, Chris Laurence, Sonia Slany, Skaila Kanga, Chris Tombling, Pip Eastop, Patrick Kiernan, Boguslaw Kostecki, Peter Lale, Paul Kegg, Mike Lovatt, Julie Andrews, Everton Nelson, Martin Loveday, Richard Watkins, Perry Montague‐Mason, Andy Wood, Steve Henderson, Jim McLeod, Mark Berrow, Paul Clarvis, Peter Hanson, Frank Schaefer, Bruce White, Gary Kettel, David Daniels, David Theodore, Rachel Bolt, Jonathan Williams, Owen Slade, Nigel Black, Mark Nightingale, Steve Morris, Richard Pryce, Emil Chakolov, The Young Musicians London, Rita Manning, Philip Cobb, Andrew Parker, Martin Humbey, Kate Moore, David Fuest, Steve Mair, Ed Tarrant, Jacqueline Hartley heeft bijgedragen aan Edema Ruh.