Eberhard Weber has long been acknowledged as a genius in the field of music. He invented the electric bass and added a fifth string to the instrument. His compositions like those of Chick Corea defy being described as entirely jazz, are influenced by classical, but belong to a genre beyond description. Weber speaking to me from his home in southern France, while recuperating from the effects of a stroke, spoke candidly and passionately about jazz music, but in a manner, that easily leaves its …