This is a direct recording of a collaborative performance given in France, 1976, between Heldon founder Richard Pinhas, keyboardist Patrick Gothiere and now-Stratos-Ensemble-drummer Coco Roussel. The performance was held at an exposition and also broadcasted on FM radio. Apparently the image is a photo from that same performance.
Heldon was France's premier space rock band of the 70s, founded by guitarist and electronic musician Richard Pinhas. Pinhas went on to start a thriving solo career, releasing many solo albums that contained extremely cutting-edge electronic music for the time.
For more on Heldon and Richard Pinhas... well hey, look them up!