Odo of Arezzo
Odo of Arezzo or Abbot Oddo was a Medieval composer and theorist who worked in Arezzo. Little is known about his life, except that he was an Abbot in Arezzo, working under Bishop Donatus of Arezzo. Odo composed a tonary 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".
A has been mistakenly attributed to Odo of Arezzo.