In 600 BC Pythagoras believed that the movements of the planets produced celestial music. He named this the Music of the Spheres. Furthermore he was sure he was the only person who could hear it! His theory sustained right through to the 15th Century Renaissance when it was further developed by astronomers and philosophers of the time. It was only finally dismissed by scientists in the 20th century. Pythagoras somnium imagines Pythagoras' dream of such a beautiful concept.
My thanks to Carollyn Eden for permission to use and edit the original score from her 'Music of the Spheres' broadcast on Radio 3, 1 - 5 October 2018.