Mr. Hubert Parry prefaces his suggestive treatment of Greek music by some remarks on the difficulty of the subject. 'It still seems possible,' he observes, 'that a large portion of what has passed into the domain of "well-authenticated fact" is complete misapprehension, as Greek scholars have not time for a thorough study of music up to the standard required to judge securely of the matters in question, and musicians as a rule are not extremely intimate with Greek' (_The Art of Music_, p. 24). To the present writer, who has no claim to the title of musician, the scepticism expressed in these words appears to be well founded. If his interpretation of the ancient texts furnishes musicians like Mr. Parry with a somewhat more trustworthy basis for their criticism of Greek music as an art, his object will be fully attained. TABLE OF CONTENTS § 1. _Introductory._ PAGE Musical forms called [Greek: harmoniai] or [Greek: tropoi] 1 § 2. _Statement of the question._ The terms Dorian, Phrygian, Lydian, &c. 3 § 3. _The Authorities._ Aristoxenus--Plato--Aristotle--Heraclides Ponticus--the Aristotelian _Problems_ 4 § 4. _The Early Poets._ Pratinas--Telestes--Aristophanes 5 § 5. _Plato._ The [Greek: harmoniai] in the _Republic_--The _Laches_ 7 § 6. _Heraclides Ponticus._ The three Hellenic [Greek: harmoniai]--the Phrygian and Lydian--the Hypo-dorian, &c. 9 § 7. _Aristotle--The Politics._ The [Greek: harmoniai] in the _Politics_ 12 § 8. _The Aristotelian Problems._ Hypo-dorian and Hypo-phrygian 14 § 9. _The Rhetoric._ The [Greek: harmonia] of oratory 15 § 10. _Aristoxenus._ The [Greek: topoi] or keys 16 § 11. _Names of keys._ The prefix Hypo- --the term [Greek: tonos] 19 § 12. _Plutarch's Dialogue on Music._ The Platonic modes--Lydian--Mixo-lydian and Syntono-lydian--the Mixo-lydian octave--the keys of Sacadas--[Greek: tonos] and [Greek: harmonia] 20 § 13. _Modes employed on different instruments._ Modes on wind-instruments--on the water-organ--on the cithara--on the flute 27 § 14. _Recapitulation._ Equivalence of [Greek: harmonia] and [Greek: tonos] 28 § 15._ The Systems of Greek music._ The musical System ([Greek: systêma emmeles]) 30 § 16. _The standard Octachord System._ The scale in Aristotle and Aristoxenus 31