The Antiphonary tonary missal of St. Benigne (also called Antiphonarium Codex Montpellier or Tonary of Saint-Bénigne of Dijon) was supposed to be written in the last years of the 10th century, when the Abbot William of Volpiano at St. Benignus of Dijon reformed the liturgy of several monasteries in Burgundy. The chant manuscript records mainly Western plainchant of the Roman-Frankish proper mass and part of the chant sung during the matins ("Gregorian chant"), but unlike the common form of the Gradual and of the Antiphonary, William organized his manuscript according to the chant genre (antiphons with psalmody, alleluia verses, graduals, offertories, and proses for the missal part), and these sections were subdivided into eight parts according to the octoechos. This disposition followed th