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In music theory, a tetrachord (Greek: τετράχορδoν; Latin: tetrachordum) is a series of four notes separated by three intervals.In traditional music theory, a tetrachord always spanned the interval of a perfect fourth, a 4:3 frequency proportion (approx. 498 cents)—but in modern use it means any four-note segment of a scale or tone row, not necessarily related to a particular tuning ...
The first two of these are the same as the first two tetrachords of the Greater Perfect System, with a third tetrachord placed above the Meson. When all these are considered together, with the Synemmenon tetrachord placed between the Meson and Diezeugmenon tetrachords, they make up the Immutable (or Unmodulating) System (systema
("A hymn is the praise of God with song; a song is the exultation of the mind dwelling on eternal things, bursting forth in the voice.") [13] The earliest Christian hymns are mentioned round about the year 64 by Saint Paul in his letters. The Greek hymn, Hail Gladdening Light was mentioned by Saint Basil around 370.
[61] [62] Starting with the expectation that the rhythm of Gregorian chant (and thus the duration of the individual notes) anyway adds to the expressivity of the sacred Latin texts, several word-related variables were studied for their relationship with several neume-related variables, exploring these relationships in a sample of introit chants ...
The notes of the central tetrachord of the system in ascending order are hypate, parhypate, lichanos (or hypermese), and mese. A second tetrachord is added above, after a disjunctive tone, and the corresponding names (together with the interval ratios of the standing tones) are: [6] mese (4:3) – nete (2:1) (standing) lichanos – paranete ...
Tetrachord Note order Step to next note (Number of steps) Note name starting from Rast [1] Rast pentachord: Rast tetrachord: 1 T (9) Rast 2 K (8) Dügâh 3 S (5) Segâh 4 T (9) (Only for pentachord) Çârgâh - 5 - Neva
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(A tetrachord is a series of four consecutive notes covering the interval of a fourth, e.g. C, B ♭, A ♭, G; the lichanos ("forefinger string") was the second note of a tetrachord going down; the "conjunct tetrachord" is the tetrachord whose lowest note is the mese; and the "disjunct tetrachord" is the one whose lowest note is the string ...