What notes are in a G♭7 chord?

G♭7 contains four notes: G♭ (root), B♭ (major third), D♭ (perfect fifth), and F♭ (minor seventh — same pitch as E).

Is G♭7 the same as F♯7?

Yes, enharmonically — same four pitches. G♭7 lives in flat-side contexts; F♯7 lives in B-major / sharp-side contexts.

What is a tritone substitute?

G♭7 and C7 share the same tritone (B♭-E / B♭-F♭). Substituting G♭7 for C7 in a cadence to F major creates chromatic bass motion (G♭ → F) and richer harmonic colour.

When would I see G♭7 in real music?

In jazz reharms substituting for C7, in G♭-major and C♭-major contexts (rare), and in dense chromatic Romantic music. Modern lead sheets often use F♯7 instead for readability.

Gb dominant 7 chord — notes, intervals, and practice

G♭ dominant 7 (G♭7) — G♭, B♭, D♭, F♭ — is G♭ major with a minor 7th. The F♭ (enharmonic to E) is the spelling tell that you're in deep flat-key territory. The chord is the V7 of C♭ major (= B major enharmonically) and the tritone substitute for C7 in C-major reharms.

Intervals

The Gb dominant 7 chord stacks two thirds on the root. Each interval and its size in semitones:

Gb→Bbmajor 3rd4 semitones
Bb→Dbminor 3rd3 semitones
Db→Fbminor 3rd3 semitones

On the keyboard

Each note of the Gb dominant 7 chord highlighted on a piano. Pitch class is what matters — any octave works.

On the guitar

One voicing of the Gb dominant 7 chord on a six-string guitar fretboard.

1Gb
3Bb
5Db
♭7Fb

Common mistakes

G♭7's 7th is F♭ (enharmonic to E). In jazz lead-sheet practice the chord is sometimes written G♭7 with E as the 7th letter — strictly incorrect by the seven-letter rule. Inside C♭-major or G♭-major notation, F♭ preserves consistency.

In context

G♭7 is the V7 of C♭ major and a famous tritone substitute for C7 in C-major reharms. The substitution G♭7 → Cmaj7 replaces the standard G7 → Cmaj7 with chromatic bass motion (G♭ → F → E → C-shaped landing). In G♭-major ii–V–I, the cadence runs A♭m7 → D♭7 → G♭maj7 — G♭7 doesn't appear in that progression but as the V7 of C♭ it does.

Drill it

The Gb dominant 7 chord is one of 48 in the Chord Trainer. Open the full trainer to practice it alongside related chords with timing and best-time tracking.

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Frequently asked

What notes are in a G♭7 chord?: G♭7 contains four notes: G♭ (root), B♭ (major third), D♭ (perfect fifth), and F♭ (minor seventh — same pitch as E).
Is G♭7 the same as F♯7?: Yes, enharmonically — same four pitches. G♭7 lives in flat-side contexts; F♯7 lives in B-major / sharp-side contexts.
What is a tritone substitute?: G♭7 and C7 share the same tritone (B♭-E / B♭-F♭). Substituting G♭7 for C7 in a cadence to F major creates chromatic bass motion (G♭ → F) and richer harmonic colour.
When would I see G♭7 in real music?: In jazz reharms substituting for C7, in G♭-major and C♭-major contexts (rare), and in dense chromatic Romantic music. Modern lead sheets often use F♯7 instead for readability.