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The harmonic seventh note is about 1 / 3 semitone ( ≈ 31 cents ) flatter than an equal-tempered minor seventh. When this flatter seventh is used, the dominant seventh chord's "need to resolve" down a fifth is weak or non-existent. This chord is often used on the tonic (written as I 7) and functions as a "fully resolved" final chord. [20]
The harmonic seventh chord is a major triad plus the harmonic seventh interval (ratio of 7:4, about 968.826 cents [1]). This interval is somewhat narrower (about 48.77 cents flatter, a septimal quarter tone ) and is "sweeter in quality" than an "ordinary" [ 2 ] minor seventh , which has a just intonation ratio of 9:5 [ 3 ] (1017.596 cents), or ...
The most common chords are tertian, constructed using a sequence of major thirds (spanning 4 semitones) and/or minor thirds (3 semitones). Since there are 3 third intervals in a seventh chord (4 notes) and each can be major or minor, there are 7 possible permutations (the 8th one, consisted of four major thirds, results in a non-seventh augmented chord, since a major third equally divides the ...
For example, the seventh of the dominant seventh chord, resolving to tonic, moves downward to the third of the following chord. In the key of C major, the dominant seventh chord would be G 7 ; the seventh note of this G 7 chord is F, which should resolve downwards to an E in the next bar (typically supported by a C-major chord).
[4] Dominant seventh chords are often built on the fifth scale degree (or dominant) of a key. For instance, in the C major scale, G is the fifth note of the scale, and the seventh chord built on G is the dominant seventh chord, G 7 (shown above). In this chord, F is a minor seventh above G.
A typical example of this is when ♯ IV ø 7 progresses to IVm 7, such as in the Cole Porter song "Night and Day", where there is the progression F ♯ ø 7 – Fm 7 – Em 7 – E ♭ dim 7 – Dm 7 – G 7 – CM 7. If analyzed in its predominant function, it wouldn't sufficiently explain how it functions preceding the Fm 7 chord.
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An example of such an interval is the 7:4 ratio, the harmonic seventh (B ♭). A supermajor second (or supersecond [2]) is intermediate to a major second and an augmented second. An example of such an interval is the ratio 8:7, or 231.17 cents, [1] also known as the septimal whole tone (D-Play ⓘ) and the inverse of the subminor seventh.