KingHeadache
Banned
king crimson
Genesis
yes
gentle giant
jethro tull
strawbs
gong
Steve Hillage
Daevid Allen(solo and other projects)
Soft Machine
Frank Zappa
Happy the MAn
Synergy
Hawkwind
Pure Reason Revolution
Area
Discipline
Alan Parsons
Mike Oldfield
Van Der Graaf Generator
KENSO
KBB
Ozric Tenacles
Djam Karat
Pink Floyd
Kansas
Blancodel Mutuo Soccorso
Le Orme
Flower Kings
Magma
PFM
Caravan
ELP
ELO
Camel
Present
Univers Zero
Hidria Spacefolk
Brand X
Return To Forever
Weather Report
Nektar
Echolyn
Spaced Out
Steve Hackett
UK
IQ
Porcupine Tree
Riverside
NebelNest
Beardfish
Koenji Hyakkei
Peter Hammill
okay I'll stop I could list another 25 or 30 easy