"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." --Jürgen SchrieferHeiner 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 to happen--to music in the immediate and more distant future, the implications of this book for composition, musical education and therapy are immense.The author shows how the fundamental elements of music embody distinctive modes of consciousness. He examines the musical systems of ancient humanity and draws a vivid picture of our contemporary musical situation. This seminal work is more than a theoretical treatise on the nature of music; it is also a book to be understood and experienced through musical practice. With the help of the monochord, the reader, with a minimum of musical technique and ability, can explore new and unfamiliar musical realms.