In his book he refers to Cicero (d. 43 BC), and his work was used by Martianus Capella (fl.
[2] One piece of evidence for Aristides' date, according to Winnington-Ingram, is that fact in the work he addresses two friends called Eusebius and Florentius; the latter name is unknown before AD 300.
[3] Book 1 of the work deals with the theory of music under the traditional headings of harmonics, rhythm, and metre.
It depends heavily on Aristoxenus (4th century BC), but with some "intriguing additions", apparently from a source from the classical period.
[4] Book 2 (said by Winnington-Ingram to be "extremely interesting") discusses the importance of music in the education of the young and in the moral life of individuals.