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  2. Tetrachord - Wikipedia

    en.wikipedia.org/wiki/Tetrachord

    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 ...

  3. Musical system of ancient Greece - Wikipedia

    en.wikipedia.org/wiki/Musical_system_of_ancient...

    The sub-intervals of the tetrachord were unequal, with the largest intervals always at the top, and the smallest at the bottom. The 'characteristic interval' of a tetrachord is its largest one. The Greater Perfect System ( systema teleion meizon ) was composed of four stacked tetrachords called (from lowest to highest) the Hypaton , Meson ...

  4. All-interval tetrachord - Wikipedia

    en.wikipedia.org/wiki/All-interval_tetrachord

    Interval class table for [0,1,4,6] ic notes of [0,1,4,6] built on E diatonic counterparts 1: E to F: minor 2nd and major 7th 2: A ♭ to B ♭ major 2nd and minor 7th 3: F to A ♭ minor 3rd and major 6th 4: E to G ♯ major 3rd and minor 6th 5: F to B ♭ perfect 4th and perfect 5th 6: E to B ♭ augmented 4th and diminished 5th

  5. Tetrad (music) - Wikipedia

    en.wikipedia.org/wiki/Tetrad_(music)

    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).

  6. Chord (music) - Wikipedia

    en.wikipedia.org/wiki/Chord_(music)

    A guitarist performing a C chord with G bass. In Western music theory, a chord is a group [a] of notes played together for their harmonic consonance or dissonance.The most basic type of chord is a triad, so called because it consists of three distinct notes: the root note along with intervals of a third and a fifth above the root note. [1]

  7. Diatonic and chromatic - Wikipedia

    en.wikipedia.org/wiki/Diatonic_and_chromatic

    [g] A diatonic tetrachord comprised, in descending order, two whole tones and a semitone, such as A G F E (roughly). In the chromatic tetrachord the second string of the lyre was lowered from G to G ♭, so that the two lower intervals in the tetrachord were semitones, making the pitches A G ♭ F E.

  8. All-trichord hexachord - Wikipedia

    en.wikipedia.org/wiki/All-trichord_hexachord

    [1] In music, the all-trichord hexachord is a unique hexachord that contains all twelve trichords, or from which all twelve possible trichords may be derived. [2] The prime form of this set class is {012478} [1] and its Forte number is 6-Z17. Its complement is 6-Z43 and they share the interval vector of <3,2,2,3,3,2>.

  9. List of unsolved problems in biology - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    1.2 Biochemistry and cell biology. 1.3 ... solely on its amino-acid chain with an accuracy of around 90% on a test sample of proteins ... problem: Is it possible to ...