Rudolf Steiner's approach to music is unusual: it is not acoustics that form the basis of music, but the inaudible. With this statement, he has established music on a new foundation. For him, the true world of music is the realm of spherical harmonies, which permeate all areas, from the chemistry of substances to the growth of plants and the morphology of the human form. The editor illustrates how entirely new insights into tones, intervals, musical instruments, and compositions arise from this perspective through statements by Rudolf Steiner and accompanying commentary. An inspiring reading book for every music lover.