Chords
Gb Augmented seventh
Gb · Bb · D · Fb
A dominant seventh with a raised fifth — an augmented triad with a seventh on top.
Also written Gb+7 · Gb7+ · Gb7aug · Gbaug7
Gb Augmented seventh
Gb · Bb · D · Fb
Voicings on the piano
| Voicing | Notes | Play it on your instrument |
|---|---|---|
| Closed, root position | Gb3 · Bb3 · D4 · Fb4 | |
| Open (drop 2) | D3 · Gb3 · Bb3 · Fb4 | |
| Shell | Gb3 · Bb3 · Fb4 | |
| Rootless | Bb3 · D4 · Fb4 |
Tap a key or a fret to hear it.
Anatomy
Gb Augmented seventh (Gb7#5) contains the notes Gb · Bb · D · Fb, each with a role measured as an interval from the root.
Read on: how triads are built · seventh chords
Inversions
An inversion of Gb Augmented seventh puts a chord tone other than Gb in the bass; the name after the slash is that bass note.
Where it lives
The keys and the scales Gb Augmented seventh belongs to.
In which keys
Gb Augmented seventh is diatonic to 1 key; the numeral is its degree and the label its harmonic function.
- B minorV+7#5Dominant
Scales that contain it
Gb Augmented seventh fits inside these scales, each built on Gb.
- Gb Whole ToneGb · Ab · Bb · C · D · E
- Gb Leading Whole ToneGb · Ab · Bb · C · D · Fb · F
- Gb Messiaen's Mode #6Gb · Ab · Bb · Cb · C · D · E · F
Understanding the Gb Augmented seventh chord
Names and symbols
Gb7#5 is the chord symbol for Gb Augmented seventh; it is also written Gb+7, Gb7+, Gb7aug, Gbaug7.
7♯5, +7 and aug7 usually all mean this chord: a dominant seventh on an augmented triad. Some books use aug7 for the major seventh on the augmented triad instead, so check which seventh a chart intends.
How it is built
On Gb it is Gb · Bb · D · Fb, stacking 1P · 3M · 5A · 7m. Raising the fifth turns the underlying triad augmented and makes the chord symmetrical in its lower three notes.
How it is used
The raised fifth is a semitone above the natural one, so it leans harder toward the tonic. It is a standard altered dominant, especially heading into a minor chord, and it fits the whole-tone scale exactly.
Learn this properly
Chapter 17: Theory in StylesCommon questions
- What notes are in Gb7#5?
- Gb7#5 contains Gb · Bb · D · Fb. Name any set of notes with the chord identifier.
- What scale fits a 7♯5 chord?
- The whole-tone scale, which contains the root, major third, augmented fifth and minor seventh exactly.
- Is 7♯5 the same as 7♭13?
- The same pitch, different function. ♯5 replaces the fifth; ♭13 is added above a chord that still has its natural fifth.
- What notes are in the Gb Augmented seventh chord?
- The Gb Augmented seventh chord contains the notes Gb · Bb · D · Fb: the root Gb with the intervals 1P, 3M, 5A, 7m stacked above it. Play them together for the chord or one after another for an arpeggio. The lowest note is normally Gb, but any chord tone can take the bass in an inversion.
- What intervals make up the Gb Augmented seventh chord?
- Measured from Gb, the Gb Augmented seventh chord stacks the intervals 1P, 3M, 5A, 7m. The quality of the third and of the seventh, if there is one, is what gives the chord its character; the rest of the notes colour it. Every interval in the formula links to its own page, with its sound.