John Brunner 
Dramaturges of Yan [EPUB ebook] 

The far-flung fingers of Earth’s civilisation touched many corners of the galaxy, and among them was the beautiful planet Yan. Here the colonists lived a peaceful, almost idyllic life, amid ancient and secret relics, co-existing with their strange and compatible neighbours. The arrival of Gregory Chart, the greatest dramatist ever, whose productions were played out in the skies, and whose actors were also the audience, could only disrupt and destroy once the Yanfolk were aroused from their dreaming indifference . . .(First published 1972)