Guido d'Arezzo (Mercury)

Italian musical theorist (c. 990-1050).

Guido d'Arezzo is a crater on Mercury. It has a diameter of 66 kilometers. Guido d'Arezzo is named for the Italian music theorist Guido of Arezzo, who lived from 990 to 1050. (wikipedia entry)

A crater is a circular depression likely created by an impact event. On Mercury they are named after deceased artists, musicians, painters, and authors who have made outstanding or fundamental contributions to their field and have been recognized as art historically significant figures for more than 50 years.