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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:
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 ...
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 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 ♭.
The scheme I-x-V-I symbolizes, though naturally in a very summarizing way, the harmonic course of any composition of the Classical period.This x, usually appearing as a progression of chords, as a whole series, constitutes, as it were, the actual "music" within the scheme, which through the annexed formula V-I, is made into a unit, a group, or even a whole piece.
0 4 7: Major Dominant eleventh chord: ... 0 4 7 9: Major Major sixth ninth chord ("6 add 9", [2] Nine six, [3] 6/9) ... 12 (UTC). Text is available ...
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[12] In jazz, 7 ♯ 9 chords, along with 7 ♭ 9 chords, are often employed as the dominant chord in a minor ii–V–I turnaround. For example, a ii–V–I in C minor could be played as: Dm 7 ♭ 5 – G 7 ♯ 9 – Cm 7. The 7 ♯ 9 represents a major divergence from the world of tertian chord theory, where chords are stacks of major and ...