1. Harley MS 3199, ff 2r-55v Reference (shelfmark): Harley MS 3199, ff 2r-55v Title: Helperic of Auxerre, Computus Scope & Content: Helperic of Auxerre, Computus. Collection Area: Western Manuscripts Languages: Latin Date Range: 1st half of the 12th century Extent: 54 folios.
2. Harley MS 3199, ff 55v-56r Reference (shelfmark): Harley MS 3199, ff 55v-56r Title: Guido of Arezzo, De Constitutionibus in Musica Scope & Content: Guido of Arezzo, De Constitutionibus in Musica Collection Area: Western Manuscripts Languages: Latin Date Range: 1st half of the 12th century Extent: 2 folios.
3. Harley MS 3199, ff 56v-58r Reference (shelfmark): Harley MS 3199, ff 56v-58r Title: Guido of Arezzo, Praefatio in Antiphonarium Scope & Content: Guido of Arezzo, Praefatio in Antiphonarium Collection Area: Western Manuscripts Languages: Latin Date Range: 1st half of the 12th century Extent: 3 folios.
4. Harley MS 3199, ff 58v-65r Reference (shelfmark): Harley MS 3199, ff 58v-65r Title: Guido of Arezzo, Epistola de cantu ignoto (Epistola ad Michaelem) Scope & Content: Guido of Arezzo, Epistola de cantu ignoto, also known as the Epistola ad Michaelem Collection Area: Western Manuscripts Languages: Latin Date Range: 1st half ofthe 12th century Extent: 8 folios.
5. Harley MS 3199, ff 65r-70v Reference (shelfmark): Harley MS 3199, ff 65r-70v Title: Musica enchiriadis, attributed to Hoger of Laon (excerpt) Scope & Content: An excerpt from the Musica enchiriadis, attributed to Hoger of Laon Collection Area: Western Manuscripts Languages: Latin Date Range: 1st half of the 12th century Extent: 6 folios.
6. Harley MS 3199, ff 71r-74r Reference (shelfmark): Harley MS 3199, ff 71r-74r Title: A text on computus Scope & Content: A text on computus, incipit: 'Notum sit omnibus hominibus ut quicumque adventum domini diligenter celebrare...' Collection Area: Western Manuscripts Languages: Latin Date Range: 1st half of the 12th century Extent: 4 folios.
7. Harley MS 3199, ff 74r-79r Reference (shelfmark): Harley MS 3199, ff 74r-79r Title: Guido of Arezzo, De tonis Scope & Content: Guido of Arezzo, De tonis Collection Area: Western Manuscripts Languages: Latin Date Range: 1st half of the 12th century Extent: 6 folios.
8. Harley MS 3199, ff 79r-88v Reference (shelfmark): Harley MS 3199, ff 79r-88v Title: Guido of Arezzo, Micrologus Scope & Content: Guido of Arezzo, Micrologus. The imperfect text is continued on ff. 91v-95v. Collection Area: Western Manuscripts Languages: Latin Date Range: 1st half of the 12th century Extent: 10 folios.
9. Harley MS 3199, ff 89r-91r Reference (shelfmark): Harley MS 3199, ff 89r-91r Title: Office of the Nativity of the Virgin Mary Scope & Content: An office of the Nativity of the Virgin Mary Collection Area: Western Manuscripts Languages: Latin Date Range: 1st half of the 12th century Extent: 3 folios.
10. Harley MS 3199, ff 91v-94v Reference (shelfmark): Harley MS 3199, ff 91v-94v Title: Guido of Arezzo, Micrologus Scope & Content: Guido of Arezzo, Micrologus, ends imperfectly Collection Area: Western Manuscripts Languages: Latin Date Range: 1st half of the 12th century Extent: 4 folios.