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The second mode, also called the octatonic, diminished, whole-half, or half-whole scale, is divided into four groups of three notes each. It contains the intervals semitone, tone, semitone, tone, semitone, tone, semitone, tone – it has three transpositions, like the diminished 7th chord, and two modes: Play ⓘ
The augmented minor seventh chord may be considered an altered dominant seventh and may use the whole tone scale, as may the dominant seventh flat five chord. [7] See chord-scale system. The augmented seventh chord normally acts as a dominant, resolving to the chord a fifth below. [8] Thus, G aug 7 resolves to a C major or minor chord, for example.
the chord quality (e.g. minor or lowercase m, or the symbols o or + for diminished and augmented chords, respectively; chord quality is usually omitted for major chords) whether the chord is a triad, seventh chord, or an extended chord (e.g. Δ 7) any altered notes (e.g. sharp five, or ♯ 5) any added tones (e.g. add2)
The diminished seventh chord is a four-note chord (a seventh chord) composed of a root note, together with a minor third, a diminished fifth, and a diminished seventh above the root: (1, ♭ 3, ♭ 5, 7). For example, the diminished seventh chord built on B, commonly written as B o 7, has pitches B-D-F-A ♭:
Half-diminished seventh chord on C (Play ⓘ). A diminished triad with a minor seventh is a half-diminished chord, usually notated either Cm 7(♭ 5) or C ø7. A diminished triad played over a root a major third away creates a Dominant 7th chord, notated C 7, with a C Major triad on the bottom, and an E° from the chord third of C (C E G B ...
The diminished seventh is used quite readily in the minor key, where it is present in the harmonic minor scale between the seventh scale step and the sixth scale step in the octave above. In 12-tone equal temperament , a diminished seventh is equal to nine semitones, a ratio of 2 9/12 :1 (approximately 1.6818), or 900 cents, and is ...
Being augmented, it is classified as a dissonant interval. [4] However, it is enharmonically equivalent to the perfect octave . Since an octave can be described as a major seventh augmented by a diatonic semitone , the augmented seventh is the sum of an octave, plus the difference between the chromatic and diatonic semitones, which makes it a ...
The half-diminished seventh plays the vii ø 7 role. While absent from the tertian harmonization of the major scale, The diminished seventh plays the vii o 7 role in the tertian harmonization of the harmonic minor scale. [81] Besides these five types there are many more seventh-chords, which are less used in the tonal harmony of the common ...