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1997 – 2011" – 2011* "cosmas – remastered" – 2012* "wedding song" – 2012 (singiel)=== landmarq ===* "solitary witness" – 1992* "infinity parade" – 1993* "the vision pit" – 1995=== threshold ===* "wounded land" – 1993* "extinct instinct" – 1997* "paradox" – 2009 (kompilacja singli)* "march of progress" – 2012=== rick wakeman and the new english rock ensemble ===* "out of the blue (live)" – 2001* "live in buenos aires" (dvd) – 2001* "out there – the movie" – 2003=== headspace ===* "i am..." (ep) – 2007* "i am anonymous" – 2012=== maiden united ===* "mind the acoustic pieces" – 2010* "the trooper (singiel) – 2010* "across the seventh sea – 2012=== arjen anthony lucassen ===* "ayreon" – "into the electric castle" – 1998* "ayreon" – "" – 2000 (główny wokal w „and the druids turned to stone”)* "ayreon" – "" – 2000 (wokal wspierający „dawn of a million souls”)* "ayreon" – "ayreonauts only" – 2000 (wokal główny w „into the black hole”)* "star one" – "space metal" – 2002* "star one" – "live on earth" – 2003* "stream of passion" – "live in the real world" – 2006* "star one" – "victims of the modern age" – 2010=== z innymi artystami ===* "lasalle" – lasalle – 1993* "tales from yesterday" w/jeronimo road – 1995 (wokal główny w „starship trooper”)* "micha calvin" – evolution 2 – 1995 (wokal wspierający)* "shadowland" – mad as a hatter – 1996 (wokal wspierający w „salvation comes”)* "revealing songs of yes" –2001 (wokal główny w „going for the one” & „and you & i”)* "after forever" – emphasis (single) – 2001 (wokal główny w „imperfect tenses” i „who wants to live forever”)* "shadowkeep" – a chaos theory – 2001 (wokal wspierający)* "wicked sensation" – reflected – 2002 (wokal wspierający w „you’re the answer”, „stand tall”, „highspeed chase”, „the preacher”, „night on fire”, „caught in a fantasy”, „let it ride”, and „joker in the pack”)* "mostly autumn" – passengers – 2003 (wokal wspierający)* "gary hughes" – once & future king part 1 – 2003 (wokal główny w „excalibur”)* "aina" – days of rising doom – 2003 (wokal w „revelations”)* "shadrane" – neurastasia – 2004* "jeronimo road" – live at the orange – 2006* "resource" – more than a feeling – 2006 (singiel)* "bass bumpers" – 2006* "after forever" – mea culpa – 2006* "port mahadia" – echoes in time- 2007* "casual silence" – lost in life – 2007 (gościnnie)* "guy fletcher" – inamorata – 2008 (wokal wspierający)* "galexia" – recidivate – 2008 (single)* "archangel " – the akallabeth – 2009* "seti " – discoveries – 2010* "unwritten pages " – part 1.paisse läos tu nammat.
b-side contains the same song performed by alex sharpe)===with landmarq===*"solitary witness" - 1992*"infinity parade" - 1993*"the vision pit" - 1995===with threshold===*"wounded land" - 1993*"extinct instinct" – 1997*"paradox" – 2009 (singles box set)*"march of progress" – 2012===with rick wakeman and the new english rock ensemble===*"out of the blue (live)" – 2001*"live in buenos aires" (dvd) - 2001*"out there - the movie" - 2003===with headspace===* "i am..." (ep) - 2007* "i am anonymous" - 2012===with maiden united===* "mind the acoustic pieces" - 2010* "the trooper (single) - 2010* "across the seventh sea - 2012===with arjen anthony lucassen===* "ayreon" - "into the electric castle" - 1998* "ayreon" - "" – 2000 (lead vocals on "and the druids turned to stone")* "ayreon" - "" – 2000 (backing vocals on "dawn of a million souls")* "ayreon" - "ayreonauts only" – 2000 (lead vocals on "into the black hole")* "star one" - "space metal" – 2002* "star one" - "live on earth" – 2003* "stream of passion" - "live in the real world" – 2006* "star one" - "victims of the modern age" – 2010===with other artists===* "lasalle" – lasalle – 1993* "tales from yesterday" w/jeronimo road - 1995 (lead vocals on the "starship trooper")* "micha calvin" - evolution 2 - 1995 (backing vocals)* "shadowland" - mad as a hatter – 1996 (backing vocals on "salvation comes")* "revealing songs of yes" -2001 (lead vocals on "going for the one" & "and you & i")* "after forever"- emphasis (single) – 2001 (lead vocals on "imperfect tenses" & "who wants to live forever")* "shadowkeep"- a chaos theory – 2001 (backing vocals)* "wicked sensation"- reflected – 2002 (backing vocals on "you're the answer", "stand tall", "highspeed chase", "the preacher", "night on fire", "caught in a fantasy", "let it ride", and "joker in the pack")* "mostly autumn" - passengers – 2003 (backing vocals)* "gary hughes" - once & future king part 1 - 2003 (lead vocals on "excalibur")* "aina" - days of rising doom – 2003 (vocals on "revelations")* "shadrane" – neurastasia - 2004* "jeronimo road" - live at the orange - 2006* "resource" - more than a feeling – 2006 (single)* "bass bumpers" - 2006* "after forever" - mea culpa - 2006* "port mahadia" – echoes in time- 2007* "casual silence" - lost in life – 2007 (guest vocals)* "guy fletcher" – inamorata – 2008 (backing vocals)* "galexia" – recidivate – 2008 (single)* "archangel " - the akallabeth - 2009* "seti " - discoveries - 2010* "unwritten pages " – part 1.":"paisse läos tu nammat.
