1st millennium BC in music – 1st millennium in music – 11th century in music Events ca. 150 – Claudius Ptolemaeus writes his treatise Harmonics ca. 510 – Boethius writes De institutione musica as one part of his "quadrivium". ca. 635 – Isidore of Seville compiles the Etymologiae ca. 795–800 – Tonary of St Riquier, the earliest Western source organized according to the eight Gregorian modes, borrowed from the Byzantine octoechos system 9th century – Notker the Stammerer explains the supplementary letters for neumatic notation in his Epistola ad Lantbertum. ca. 850 – Aurelian of Réôme writes the earliest extant medieval treatise on music, Musica disciplina. ca. 890 – compilation of the Musica enchiriadis, the earliest known treatise on polyphony. ca. 900 – compilation of the Scolica enchiriadis, a commentary on the Musica enchiriadis. ca. 908–915 – Regino of Prüm writes De harmonica institutione, the first full tonary for the texts of the liturgy, at St. Martin of Trier Classical music late 3rd century – Oxyrhynchus hymn, the earliest known Christian hymn to contain both lyrics and musical notation ca. 9th–10th century – Gregorian chants first used see list of Gregorian chants 884 – Liber Hymnorum completed by Notker the Stammerer at the Abbey of Saint Gall in Switzerland. Births ca. 83 – Claudius Ptolemaeus ca. 480 – Anicius Manlius Severinus Boethius ca. 767/772 – Ishaq al-Mawsili ca. 840 – Notker the Stammerer ca. 850 – Hucbald ca. 850 – Tuotilo Deaths 161 – Claudius Ptolemaeus ca. 524 – Anicius Manlius Severinus Boethius 4 April 636 – Isidore of Seville 864 – Hartmann of Saint Gall ca. 890 – Ratpert of Saint Gall 915 – Regino of Prüm 27 April 915 – Tuotilo 6 April 919 – Notker the Stammerer 20 June 930 – Hucbald of St. Amand See also List of years in music References Sources Music