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Biography
: Several medieval music theorists named Odo have been confused historically. For the other major theorist of this name, see Odo of Cluny . Odo of Arezzo or Abbot Oddo ( fl. late 10th century) was a Medieval composer and music theory|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 (a book of chant s which usually included antiphon s and responsory|responsories ) with a discussion of Musical mode|modes , which survives in 20 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".Brockett
A Dialogus de musica has been mistakenly attributed to Odo of Arezzo.
References
Clyde Brockett. "Odo 2. Odo of Arezzo", Grove Dictionary of Music and Musicians|Grove Music Online , ed. L. Macy (accessed May 20, 2006), http://www.grovemusic.com/ grovemusic.com (subscription access).