Arezzo is a city in Tuscany, Italy that was an important Etruscan town. It was known to the Romans as Arretium. Arezzo was made in the 11th cent. a free commune, siding with the Ghibellines. Arezzo is also famous for Guido d'Arezzo, the Medieval abbot who originated solfeggio the mnemonic music system known to many from the song in The Sound of Music that starts "Doe, a deer".Nowadays, it is an agricultural trade center and has machine, clothing, gold, and jewelry industries and is also a tourist center.