Tangerine Dream in the Kunsthalle in Düsseldorf: thanks to Hajo (Hans-Joachim) Liese for the pictures
Hajo is a German based synth player, part of El-Ka and he owns a Youtube channel with great videos, visit here.
I have not yet found a recording of this live performance, but just to get you in the right mood here is a part of the 1975 performance of Richothet, at Coventry Cathedral 1975.
Please note that all images and recordings are (c) by the owner.