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The dominant seventh chord is frequently used to approximate a harmonic seventh chord, which is one possible just tuning, in the ratios 4:5:6:7 [1] Play ⓘ, for the dominant seventh. Others include 20:25:30:36 Play ⓘ , found on I, and 36:45:54:64, found on V, used in 5-limit just tunings and scales.
The tritone substitution can be performed by exchanging a dominant seventh chord for another dominant seventh chord which is a tritone away from it. For example, in the key of C major one can use D ♭ 7 instead of G 7 (D ♭ is a tritone away from G, and G is the dominant of C).
The harmonic seventh chord is a dominant seventh chord formed by a major triad plus a harmonic seventh interval. The harmonic seventh interval is a minor seventh tuned in the 7:4 pitch ratio, one of the possible "just ratios" defined for this interval in just intonation (slightly below the width of a minor seventh as tuned in equal temperament ...
The dominant seventh (V7) chord G7=(G,B,D,F) increases the tension with the tonic (I) chord C. Adding a minor seventh to a major triad creates a dominant seventh (denoted V7). In music theory, the "dominant seventh" described here is called a major-minor seventh, emphasizing the chord's construction rather than its usual function. [27]
Also in jazz harmony, the tritone is both part of the dominant chord and its substitute dominant (also known as the sub V chord). Because they share the same tritone, they are possible substitutes for one another. This is known as a tritone substitution. The tritone substitution is one of the most common chord and improvisation devices in jazz.
This generally occurs in a major key, since the flattening of the sixth degree in the natural minor scale renders a dominant diminished seventh chord fully diminished if played within the scale. Indeed, the VII half diminished chord in a major key is identical to a dominant ninth chord (a dominant seventh with a major ninth) with its root omitted.
The chord a minor third above, ♭ VII 7, may be substituted for the dominant, and may be preceded by its ii: iv 7. [16] Due to common use the two chords of the backdoor progression (IV 7-♭ VII 7) may be substituted for the dominant chord. [11] In C major the dominant would be G7: GBDF, sharing two common tones with B ♭ 7: B ♭ DFA ♭.
In jazz, the altered scale, altered dominant scale, or super-Locrian scale (Locrian ♭ 4 scale) is a seven-note scale that is a dominant scale where all non-essential tones have been altered. This means that it comprises the three irreducibly essential tones that define a dominant seventh chord , which are root, major third, and minor seventh ...