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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 ...
Dominant seventh chord on C: C 7 Play ⓘ.. A tetrad is a set of four notes in music theory.When these four notes form a tertian chord they are more specifically called a seventh chord, after the diatonic interval from the root of the chord to its fourth note (in root position close voicing).
All-interval tetrachords (Play ⓘ). An all-interval tetrachord is a tetrachord , a collection of four pitch classes , containing all six interval classes . [ 1 ] There are only two possible all-interval tetrachords (to within inversion), when expressed in prime form.
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Tetrachords (dörtlü) are on the left, pentachords (beşli) on the right. The symbols (simge) from the table above are here used to signal the intervals used in these patterns. Similar to the construction of maqamat noted above, a makam in Turkish music is built of a tetrachord built atop a pentachord, or vice versa.
What you say about the ancient Greek Harmoniai is true, however what you list here in this talk as the medieval Lydian tetrachord is not true, it should read tone, tone, semitone (not tone, tone, and tone), which reflects the structure of the upper fourth of the Lydian mode. Medieval thought used species of the fifth and species of the fourth.