Matthias Jabs (Scorpions)
Rudolf Schenker (Scorpions)Klaus Meine (Scorpions)
Uli Jon Roth
Richie Sambora (Bon Jovi)
Neil Schon (Journey, Santana, Paul Rodgers a.m.m.)
Eric Bazilian ( The Hooters, Robbie Williams, Christina Aguilera, Ricky Martin, Joan Osborne, Cyndi Lauper, Patty Smyth, Jon Bon Jovi, Alannah Myles, Midge Ure, Leann Rimes, Journey, Zucchero, Jennifer Love Hewitt, Belinda Carlisle, Willie Nelson, Mick Jagger, TV a.m.m.)
Stephen Stills (Crosby Stills & Nash a.m.m.)Carl Carlton (Mink DeVille, Manfred Mann's Earthband, The Songdogs, Udo Lindenberg, Nina Hagen, Peter Maffay, George Kranz, Wolfgang Niedecken, Robert Palmer a.m.m.)
Ken Hensley (Uriah Heep, Jethro Tull, Gods/Mick Taylor, Lake/Emerson Lake & Palmer, , Blackfoot, WASP, John Lawton)
Mikael Nord Andersson (Roxette, The Rasmus a.m.m.)
Johan Daansen (Scorpions, Nina Hagen, Helene Fischer a.m.m.)
Rick Parfitt (Status Quo)
Oliver Leiber (Rod Stewart, Paula Abdul a.m.m.)
Roland Grapow (Helloween, Kaleidoscope, Masterplan)Markus Großkopf (Helloween)
Ingo Powitzer (Scorpions guitar tech)
Fiona MacMahon (Singer / Songwriter from Limerick, Ireland)
James Hetfield (Metallica)
Ali Claudi (Ali Claudi Trio a.m.m.)
Lukas Hilbert (Popstars, Blümchen, Udo Lindernberg a.m.m.)
Nelson F. Ferrer (Singer / Songwriter, Brooklyn, NewYork)Peter Driessen (Blues Express)
Gregor Hilden
Juraj Galan
Ralf Jung
and many more ...
