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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.
Put another way, it is the key whose tonic is the dominant scale degree in the main key. [8] If, for example, a piece is written in the key of C major, then the tonic key is C major and the dominant key is G major since G is the dominant note in C major. [9] "Essentially, there are two harmonic directions: toward I and toward V.
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 ...
A typical sequence of a jazz or rock song in the key of C major might indicate a chord progression such as C – Am – Dm – G 7. 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 this role, a diminished seventh chord resolves to a major or dominant seventh chord whose root is one of the notes of the diminished seventh chord (common tone), the most common being the raised supertonic seventh, which resolves to the tonic in major keys (♯ ii o 7 –I, shown below) and the raised submediant, which resolves to dominant ...
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).
In a major key, the supertonic triad (ii) is minor, and in a minor key it is diminished. The dominant is, in its normal form, a major triad and commonly a dominant seventh chord. With the addition of chord alterations, substitutions, and extensions, limitless variations exist on this simple formula.
In the key of A Major the V chord, E dominant 7th (which is made up the notes E, G ♯, B, and D) can be replaced with a G ♯ diminished seventh chord (G ♯, B, D, F). If the diminished seventh chord (G ♯ ) is followed by the I chord (A), this creates chromatic ( stepwise semitonal) root movement, which can add musical interest in a song ...