Cleonides () is the author of a Greek treatise on music theory titled ÃÂá¼°ÃÂñóÃÂóὴ á¼ÂÃÂüÿýùúî Eisagà Âgàharmonikà(Introduction to Harmonics). The date of the treatise, based on internal evidence, can be established only to the broad period between the 3rd century BCE and the 4th century CE; however, treatises titled eisagà Âgàgenerally began to appear only in the 1st century BCE, which seems the most likely period for Cleonides' work.
The attribution of the Eisagà Âgàin some manuscripts to Euclid or Pappus is incompatible with the Aristoxenian approach adopted in the treatise. A few manuscripts name a "Zosimus" as the author.
Cleonides' treatise is the clearest account of the technical aspects of Aristoxenus's musical theory.