Treatises

This list was compiled with the help of Google.
AntiquityDateRegion
Aristoxenus — Harmonics (Elementa Harmonica)
4th c. BCE
Greece (Greek)
Aristoxenus — Rhythmics (Rhythmica)
4th c. BCE
Greece (Greek)
Nicomachus — Manual (Elements) of Harmonics
1st–2nd c. CE
Greek (Hellenistic)
Ptolemy — Harmonics (Harmonica)
2nd c. CE
Alexandria (Greek)
Cleonides / Anonymous Byzantine Theory
Late antiquity / Byzantine (c. 1st millennium CE)
Byzantine Greek
Post-classical / Medieval
Boethius — De institutione musica
early 6th c. CE
Rome / Latin
Bharata — Nāṭyaśāstra
c. 2nd c. BCE–2nd c. CE (date debated)
Indian (Sanskrit)
Dattilam (Dattila)
early centuries CE (approx.)
Indian (Sanskrit)
Brihaddeshi (Matanga)
7th–8th c. CE
Indian (Sanskrit)
Sangita-Ratnakara
13th c. CE
Indian (Sanskrit)
Yueshu yaolu (Key Points from the Treatises of Music)
Tang dynasty fragments (c. 7th–8th c.)
China
(Classical Chinese)
Guqin manuals (Qinpu collections)
Early medieval onward (many items preserved)
China
(Classical Chinese)
Al-Farabi — Kitāb al-Mūsīqā al-Kabīr (The Great Book of Music)
10th c. CE
Islamic Golden Age
(Arabic/Persian transmission)
Al-Kindi — musical writings
9th c. CE
Arabic
Avicenna (Ibn Sīnā) — chapters on music
11th c. CE
Persian/Arabic
Safi al-Din al-Urmawi — Kitāb al-Adwār
13th c. CE
Arabic/Persian
Hagiopolites (Byzantine treatise)
c. 10th c. CE
Byzantine Greek
Medieval Latin and Carolingian theoretical texts (various)
8th–12th c. CE
Western Europe (Latin)
Guido of Arezzo — Micrologus (and related treatises)
c. 11th c. CE
Western Europe (Latin)
Collections of organology/tuning lists (various medieval manuscripts)
Medieval period
Global (various languages)
Renaissance
17th Century
18th Century
19th Century
20th Century
21st Century