"Such a memorable performance. The lights went down and a disembodied voice drifted around the concert hall's
quadraphonic speaker system "I've been mad for years ....etc.". Then as the lights gradually appeared on stage we felt as
if the seats were falling through the floor, the lights were on hydraulic lifts and were slowly rising from the floor of the stage.
The effects of moving lights and circling sounds made us all feel totally disorientated. (How easily amused we were then !)."