The early clip of Tangerine Dream is quite fun, but not really great music. That is Klaus Schulze on drums! Really Edgar Froese is the only link between this lineup at the later band.
The crowd look pretty awkward and sheepish, like they didn't really know what they were meant to be doing, but it had to be something far out. This reflects on something I read about the band Van Der Graaf Generator. When they first went over to Germany in the late '60s nobody knew what this counter culture was about, and the audience was basically short-haired kids raised on Schlager music. The next time VDGG were over there, only a short period of time later, everybody had their hair grown out to their waist and spent their time hanging out with Andreas Baader and the like in weird communes. LSD consumption was rife; well above anything VDGG were up to.