Mark Jansen (EPICA)
Isaac Delahaye (EPICA)
Kevin Storm (CARDAMON)
Koen Romein (CARDAMON)
Eric Hazebroek (Stream of Passion, The Saturnine)
Tommy Wlaeminck (Session Guitarist)
Frederic DE CECCO(Breach TheVoid, Further Dimension)
Zbigniew Krebs (Maryla Rodowicz, Chemia)
Jacek "Perkoz" Perkowski ( T. love, De Mono, Azyl P, Kobranocka)
Split Secound Sound Studio (Amsterdam, Holland)
K-Studio (Radom, Poland)
Jan Benedek( T.Love )
Marcin Limek (96 Project)
Dariusz Kozakiewicz (PERFECT)
Artur Gierczak (Reni Jusis, Łukasz Zagrobelny)
Artur Tabor (Artrosis, Opaleni, Teatr Studio Buffo)
Marcin Olak ( Session Guitarist, Michał Bajor)
Robert Fredrich Litza (KNŻ,Arka Noego)
Adam Burzyński (KNŻ)
Michał Kwiatkowski (KNŻ)
Tomek Lipiński (TILT)
Riverside
Wojciech Cieślak-Amor (PIERSI)
Jarosław Śmietana
Artur Kempa ( Wrinkled Fred, Neolithic)
Strachy na Lachy
Space Avenue