Dominant seventh flat five chord
| Component intervals from root | |
|---|---|
| minor seventh | |
| diminished fifth (tritone) | |
| major third | |
| root | |
| Forte no. / | |
|
4-25 / |
Play In music theory, the dominant seventh flat five chord is a seventh chord composed of a root note, together with a major third, a diminished fifth and a minor seventh from root (1, ♮3, ♭5 and ♭7). For example, the dominant seventh flat five built upon C (C7♭5) would be C–E–G♭–B♭. It can be represented by the integer notation {0, 4, 6, 10}. In diatonic harmony, the dominant seventh flat five chord does not naturally occur on any scale degree (as does, for example, the dominant seventh on the fifth scale degree: C7 in F major). This chord is enharmonically equivalent to its own second inversion.
The dominant seventh flat five may be considered an altered chord, created by diminishing the fifth of a dominant seventh chord, and may use the whole-tone scale,[1] as may the augmented minor seventh chord, or the Lydian ♭7 mode,[2] as well as most of the modes of the Neapolitan major scale, such as major Locrian, leading whole-tone, and Lydian minor. It is also used as a French augmented sixth, in second inversion (4
3), and is in fact enharmonic to its second inversion.
Minor seventh flat five
Similarly, a minor seventh flat five chord (m7♭5, also called as a half-diminished seventh chord) is constructed by diminishing the fifth of a minor seventh chord:[3]
- 1 ♭3 ♭5 ♭7
- C E♭ G♭ B♭.
The minor seventh flat five chord occurs in the diminished scale[4] on multiple scale degrees as well as on the seventh degree of the major scale (e.g., B–D–F–A in C major).
Dominant seventh flat five chord table
Chord Root Major third Diminished fifth Minor seventh C7♭5 C E G♭ B♭ C♯7♭5 C♯ E♯ (F) G B D♭7♭5 D♭ F A 
(G)C♭ (B) D7♭5 D F♯ A♭ C D♯7♭5 D♯ F 
(G)A C♯ E♭7♭5 E♭ G B (A)D♭ E7♭5 E G♯ B♭ D F7♭5 F A C♭ (B) E♭ F♯7♭5 F♯ A♯ C E G♭7♭5 G♭ B♭ D (C)F♭ (E) G7♭5 G B D♭ F G♯7♭5 G♯ B♯ (C) D F♯ A♭7♭5 A♭ C E (D)G♭ A7♭5 A C♯ E♭ G A♯7♭5 A♯ C (D)E G♯ B♭7♭5 B♭ D F♭ (E) A♭ B7♭5 B D♯ F A
See also
Sources
- ↑ Manus and Hall (2008). Alfred's Basic Bass Scales & Modes/Alfred's Basic Bass Method, p.22/128. ISBN 0739055844/ISBN 0739055836.
- ↑ Berle, Annie (1996). Contemporary Theory And Harmony, p.100-101. ISBN 0-8256-1499-6.
- ↑ Morgen, Howard (1979). Concepts: Arranging for Fingerstyle Guitar, p.161. ISBN 0-7692-3075-X.
- ↑ Manus and Hall (2008), p.23/129.