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- In music theory, the half-diminished seventh chord (also known as a half-diminished chord or a minor seventh flat five) is created by taking the root, minor third, diminished fifth and minor seventh (1, ♭3, ♭5 and ♭7) of any major scale; for example, C half-diminished is (C E♭ G♭ B♭). Its consecutive intervals are minor 3rd, minor 3rd, major 3rd. In diatonic harmony, the half-diminished chord naturally occurs on the 7th scale degree (for example, Bm7 in C major). By the same virtue, it also occurs on the second degree of natural minor (e.g. Dm7 in C minor). It occurs as a leading-tone seventh chord in major and can be represented by the integer notation {0, 3, 6, 10}. Half-diminished seventh chords are often symbolized as a circle with a diagonal line through it, as in C. It also can be represented as m7♭5, -7♭5, m7(♭5) etc. The terms and symbols for this chord break expectations that derive from the usual system of chord nomenclature. Normally a symbol like "Bdim" indicates a diminished triad and "B7" indicates a major triad plus a minor seventh. Thus one would expect the term "Bdim7" to indicate a diminished triad plus a minor seventh. Instead, it means a diminished triad plus a diminished seventh. To make this distinction clear, the term "half-diminished" and the symbol were invented. Since the term dim7 (as in Bdim7) meant something else, the accurate but unwieldy term "minor seventh flat five" (as in Bm7) came to be used. "Despite the appearance of the word 'diminished' in the name of this type of seventh chord, its sound differs considerably from that of a diminished seventh chord. In fact, the only sonic connection between the two chords is the single diminished triad found in the half-diminished seventh chord. As composer-theorist Milton Babbitt has astutely pointed out, the 'half-diminished' seventh chord should be called the 'one-third' diminished seventh chord.... Whatever its deficiencies might be in the label department, however, the half-diminished seventh chord is in many respects the star of the seventh chord harmonic cast. Many songs in the classic American popular song repertoire reserve it for their most intensely expressive moments". Jazz musicians typically consider the half-diminished chord as built from one of three scales: the seventh of the major scale, the sixth mode of the melodic minor scale (the latter scale is nearly identical to the Locrian mode, except that it has a natural 9 rather than a ♭9, giving it a somewhat more consonant quality), or the "half-whole" diminished scale See: chord-scale system. The "Tristan chord" is sometimes described as a half-diminished seventh chord; however, the term "Tristan chord" is typically reserved for a very specific harmonic function, especially determined by the order of the notes from bottom to top, and sometimes even the way the chord is spelled (e.g. is it G♭ or F♯?).
- Полууменьшенный септаккорд — септаккорд, состоящий из малой, малой и большой терций, образующийся с помощью добавления к уменьшённому трезвучию малой септимы.
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- Полууменьшенный септаккорд — септаккорд, состоящий из малой, малой и большой терций, образующийся с помощью добавления к уменьшённому трезвучию малой септимы.
- In music theory, the half-diminished seventh chord (also known as a half-diminished chord or a minor seventh flat five) is created by taking the root, minor third, diminished fifth and minor seventh (1, ♭3, ♭5 and ♭7) of any major scale; for example, C half-diminished is (C E♭ G♭ B♭). Its consecutive intervals are minor 3rd, minor 3rd, major 3rd.
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