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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 ...
16-tet scale on C. Play ... 1 1 ♯ 1 1 2 2 ♯ 2 2 3 ... Tetrachords Semitones Letters Chromatic: 1 1 1: H-H-H Diminished: 1 2 1: H-W-H Gypsy :
The Pythagorean scale is any scale which can be constructed from only pure perfect fifths (3:2) and octaves (2:1). [5] In Greek music it was used to tune tetrachords, which were composed into scales spanning an octave. [6] A distinction can be made between extended Pythagorean tuning and a 12-tone Pythagorean temperament.
Also, why are these examples showing descending tetrachords, while the text at the left describes ascending tetrachords? (I don't mean that this is wrong, but doesn't it need a word of explanation?) The example of the "Descending tetrachord in the modern B Locrian" should probably have three flats in the signature.
In the musical system of ancient Greece, genus (Greek: γένος [genos], pl. γένη [genē], Latin: genus, pl. genera "type, kind") is a term used to describe certain classes of intonations of the two movable notes within a tetrachord.
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