Theoretical information
A dominant seventh chord, or major-minor seventh chord, is a chord composed of a root, major third, perfect fifth, and minor seventh. It can be also viewed as a major triad with an additional minor seventh. When using popular-music symbols, it is denoted by adding a superscript «7» after the letter designating the chord root. The dominant seventh is found almost as often as the dominant triad. In Roman numerals it is represented as V7.
| Root Position V7 – root in bass; | ||
Inversions Dominant Seventh Chord
Seventh chords can be inverted by moving the lowest note up an octave. Root position is the same as a triad — the root is the lowest (bass) note.
| First inversion: V6/5 – 3rd in bass; | |
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| Second inversion: V4/3 – 5th in bass; | |
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| Third inversion: V 4/2 — 7th in bass. | |
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Resolving Dominant Seventh Chord and Its Inversions
| Resolving V7 in Root Position: The dominant seventh chord resolves to a major or minor chord whose root is a perfect fifth below its root. In the case of the G dominant seventh chord which is the chord of the fifth degree in the key of C major, the G dominant seventh chord resolves downward by a perfect fifth. | |
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| Six-five chord D6/5 – I 3; | |
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| Four-three chord D4/3 – I 5/3; | |
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| Four-two chord D4/2 – I 6. | |
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More info Wikipedia