Content (selection): The deeper meaning of major and minor, the expansion of our tonal system through a new experience of the individual tone, the importance of different types of wood in the construction of musical instruments, problems of acoustics and interior design, the significance of music for ancient cultures, man's expression through tone and word, the inner structure of the octave, the future deepening of music up to religious experience, the origin of music in the experience of the spiritual, the world of hierarchies and the world of tones.