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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
Pyknon (from Greek: πυκνόν), sometimes also transliterated as pycnon (from Greek: πυκνός close, close-packed, crowded, condensed; Latin: spissus) in the music theory of Antiquity is a structural property of any tetrachord in which a composite of two smaller intervals is less than the remaining (incomposite) interval.
Tetrachord Note order Step to next note (Number of steps) Note name starting from Buselik [1] Buselik pentachord Buselik tetrachord (starting from Buselik) 1 T (9)
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)
Jins Hijaz is a tetrachord spanning a perfect fourth. It has a distinctive large step (an augmented second ) between the second and third pitches. Though a version of jins Hijaz exists in equal temperament, many sources claim this is an inferior rendering and give it the disparaging name "Piano Hijaz".
Tetrachord obviously refers to four notes, not three intervals. "Adjacent strings" was intended to mean that the strings produced adjacent notes. I fully reorganized the description of Greek tetrachords and scales. The new description makes better sense, but remains in need of references which may come later.
Tetrachord Note order Step to next note (Number of steps) Note name starting from Dügâh [1] Hicaz pentachord Hicaz tetrachord 1 S (5) Dügâh 2 A (12) Dik Kürdî 3 S (5) Nim Hicâz 4 T (9) (Only for pentachord) Neva - 5 - Hüseynî