Echos
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Echos is the name in Byzantine music theory for a mode within the eight-mode system, each of them ruling several melody types, and it is used in the melodic and rhythmic composition of Byzantine chant
![Intonation according to Erotapokriseis and standard intonation of echos protos: "You descend 4 steps [φοναὶ] from the echos protos [kyrios protos/auth](https://upload.wikimedia.org/wikipedia/commons/thumb/a/a4/Enechemata_%28%E1%BC%A6%CF%87%CE%BF%CF%82_%CF%80%CF%81%E1%BF%B6%CF%84%CE%BF%CF%82%2C_%E1%BC%A6%CF%87%CE%BF%CF%82_%CF%80%CE%BB%CE%B1%CE%B3%CE%B9%CE%BF%CF%82_%CF%84%CE%BF%E1%BF%A6_%CF%80%CF%81%CF%8E%CF%84%CE%BF%CF%85%29.jpg/500px-Enechemata_%28%E1%BC%A6%CF%87%CE%BF%CF%82_%CF%80%CF%81%E1%BF%B6%CF%84%CE%BF%CF%82%2C_%E1%BC%A6%CF%87%CE%BF%CF%82_%CF%80%CE%BB%CE%B1%CE%B3%CE%B9%CE%BF%CF%82_%CF%84%CE%BF%E1%BF%A6_%CF%80%CF%81%CF%8E%CF%84%CE%BF%CF%85%29.jpg)
Intonation according to Erotapokriseis and standard intonation of echos protos: "You descend 4 steps [φοναὶ] from the echos protos [kyrios protos/authentic protus] and you will find again the plagios protos, this way"
Intonation according to Erotapokriseis and standard intonation of echos devteros: "You do the same way in echos devteros. If you descend 4 steps to find its plagios, i.e. πλ β', thus"
"Parallage of John Koukouzeles": The four peripheral wheels for the Octoechos (top left: protos echoi; top right: devteros echoi; bottom left: tritos echoi; bottom right: tetartos echoi) and the tetraphonic tone system and its transpositions in the center—Koukouzelian wheel in an 18th-century manuscript (manuscript of the private collection by Demetrios Kontogiorges)
Intonations (ἐνηχήματα) for the echoi plagios devteros, varys, and plagios tetartos listed in a 17th-century papadike treatise—the intonations are followed by chant incipits (London, British Library, Harley 5544, fol. 8r)
Mode (music)
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In music theory, the term mode or modus is used in a number of distinct senses, depending on context.
Echos
…melos"), differentiated according to the chant genre and according to the performance style ("method of the thesis"). It is akin to a Western medieval tonus, an Andalusian tab', an Arab naġam (since 1400 "maqam"), or a Persian parde (since 18th-century dastgah). The noun echos in Greek means "sound" in…
Excerpt from Boethius' De musica depicting a scale
Modes Illustrated Using Movable Do Solfege (USA)