title: Odo of Arezzo
text: # Odo of Arezzo
  
  Odo of Arezzo or Abbot Oddo (fl. late 10th century) was a medieval monk who worked in Arezzo, active as composer and music theorist.
  
  ## Life and career
  
  Little is known about his life, except that he was an Abbot in Arezzo, working under Bishop Donatus of Arezzo. Odo composed a tonary (a book of chants which usually included antiphons and responsories) with a discussion of modes, which survives in twenty manuscripts, four of which contain attributions to Odo. In several of the manuscripts a prologue ascribed in three out of six to Odo is entitled "Formulas quas vobis".
  
  