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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 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 ...
Besides the dominant seventh chords discussed above, other seventh chords—especially minor seventh chords and major seventh chords—are used in guitar music. Minor seventh chords have the following fingerings in standard tuning: Dm7: [XX0211] Em7: [020000] Am7: [X02010] Bm7: [X20202] F ♯ m7: [202220] or ([XX2222] Also an A/F ♯ Chord)
The triad built on the dominant note is called the dominant chord. This chord is said to have dominant function, which means that it creates an instability that requires the tonic for resolution. Dominant triads, seventh chords, and ninth chords typically have dominant function. Leading-tone triads and leading-tone seventh chords may also have ...
Diminished seventh chord (leading-tone and secondary chord) Play ⓘ 4-28: 0 3 6 9: Diminished Dominant: Play ⓘ 3-11B: 0 4 7: Major Dominant eleventh chord:
A ninth chord includes the seventh; without the seventh, the chord is not an extended chord but an added tone chord—in this case, an add 9. Ninths can be added to any chord but are most commonly seen with major, minor, and dominant seventh chords. The most commonly omitted note for a voicing is the perfect fifth.