Hermeticist Fabre d'Olivet's classic study of music as sacred art and its profound effects on the soul. Ever since Pythagoras demonstrated the mathematical basis of music and its profound effect on the soul, the Western esoteric tradition has been deeply involved with the science and art of tone. Fabre d'Olivet (1767-1825) was the first to restate Pythagoras' ideas in modern terms, and to show the way for music to regain its spiritual heritage. He...