"Rudolf Steiner believed that an expansion of our tone-system was a necessity.... In this book of Ruland's, we have for the first time an account that is penetrating enough and of sufficiently large scope to enable us to understand why." --J?rgen Schriefer Heiner Ruland charts a practical path toward deepened our musical understanding and illuminating the panorama of humanity's musical past. Indicating what may happen--and needs...