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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.
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 ...
This chord progression instructs the performer to play, in sequence, a C major triad, an A minor chord, a D minor chord, and a G dominant seventh chord. In a jazz context, players have the freedom to add sevenths, ninths, and higher extensions to the chord. In some pop, rock and folk genres, triads are generally performed unless specified in ...
The major seventh chord, sometimes also called a Delta chord, can be written as maj 7, M 7, Δ, ⑦, etc. The "7" does not have to be superscripted, but if it is, then any alterations, added tones, or omissions are usually also superscripted. For example, the major seventh chord built on C, commonly written as Cmaj 7, has pitches C–E–G–B:
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).
However, in a minor key, the seventh scale degree is often raised by a half step (♭ to ♮), creating a major chord. These chords may also appear as seventh chords: typically as a dominant seventh chord, but occasionally in minor as a minor seventh chord v 7 with passing function: [6]
0 4 7 t: Major Dominant seventh flat five chord: Play ... 0 4 7 e 2 5: Major Major seventh chord: Play ...
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).