How To Understand Light and Sound -  Studies of the 12 Lectures by Rudolf Steiner (10) and 2 Supplemental Lectures,  called "The Light Courses"

Voice, commentary, translation, Rick Mansell,
With helpful notes and comments by Tazo of the Rosenkreuz Institute of Spiritual research

The greatest contributions of Rudolf Steiner to the world are his insights into Spiritual Science. The foundations of spiritual science are found in the work of Goethe. Rudolf Steiner worked for seven years in Weimar in the 1890s at the Goethe archive, where he edited Goethe's scientific works. This is highly significant for Steiner saw in these works the key to an understanding of Light and physics.