Caption:
Guido of Arezzo (ca. 990-ca. 1050). Italian Benedictine monk and music theorist. Monk Guido of Arezzo rehearsing in front of Pope John XIX (d. 1032). Engraving after a painting by the Italian painter Giuseppe Bertini (1825-1898). La Ilustración Española y Americana (The Spanish and American Illustration), 1883.