Arezzo is a city and comune in Italy and the capital of the province of the same name located in Tuscany. Arezzo is about 80 kilometres southeast of Florence at an elevation of 296 metres (971 ft) above sea level. As of 2022, the population was about 97,000.

Guido of Arezzo was an Italian music theorist and pedagogue of High medieval music. A Benedictine monk, he is regarded as the inventor—or by some, developer—of the modern staff notation that had a massive influence on the development of Western musical notation and practice. Perhaps the most significant European writer on music between Boethius and Johannes Tinctoris, after the former's De institutione musica, Guido's Micrologus was the most widely distributed medieval treatise on music.