Franchinus Gaffurius

First published in 1492, this compendium of musical thought, derived from Boethius and ancient philosophers, reclaimed the heritage of Greek and Latin theory for Western musicians of the 15th century. Topics such as the systems of classifying music and the physical properties of sound are covered.--Publisher's description.

This book is by a 15th century music theorist of Milan Italy. It was very influential and remains an excellent source for musical thinking in that era. It is especially helpful in relating musical pitch to the muses and to the universe.