Certain musical modes, tones, and instruments have been used to represent evil for centuries. From the torturous musical instruments depicted in Hieronymus Bosch's famous "Garden of Earthly Delights" to the dark tones that announce the presence of Darth Vader in the Star Wars films, from the cantatas of Bach and the operas of Mozart to heavy metal, music has been used to represent a gallery of rogues and demons including the devil himself. But can music do more than suggest the presence of evil? Can certain music actually embody evil? Since antiquity many have thought so. And this belief combined with religious and philosophical concepts drawn from Eastern cultures has influenced the direction of Western culture, its mythology, cosmology, theology, and politics, and consequently the structure of Western society itself. This book recounts the history of demonic music and its extraordinary influence on Western culture.