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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.
List of musical scales and modes Name Image Sound Degrees Intervals Integer notation # of pitch classes Lower tetrachord Upper tetrachord Use of key signature usual or unusual ; 15 equal temperament
[5] [6] Donald Martino had produced tables of hexachords, tetrachords, trichords, and pentachords for combinatoriality in his article, "The Source Set and its Aggregate Formations" (1961). [ 7 ] The difference between the interval vector of a set and that of its complement is <X, X, X, X, X, X/2>, where (in base-ten) X = 12 – 2C, and C is the ...
The elaboration of tetrachords was also accompanied by penta- and hexachords. The joining of a tetrachord and a pentachord yields an octachord, i.e. the complete seven-tone scale plus a higher octave of the base note. However, this was also produced by joining two tetrachords, which were linked by means of an intermediary or shared note.
A minor seventh would be added to the dominant "V" chord to increase tension before resolution (V 7 –i). [2] The roots of the chords belong to a modern phrygian tetrachord (the equivalent of a Greek Dorian tetrachord, [10] the latter mentioned above), that is to be found as the upper tetrachord of a natural minor scale (for A minor, they are: A G F E).
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.