Gb Major
Key Signature
| Property | Value |
|---|---|
| Tonic | Gb |
| Mode | Major |
| Accidentals | 6 flats |
| Key Signature Notes | Bb, Eb, Ab, Db, Gb, Cb |
Gb major has six flats and is enharmonically equivalent to F# major. It is chosen when a flat key is preferred for readability in notation and arranging.
Diatonic Chords
The seven diatonic chords of Gb Major — each built on a scale degree using only the notes of the key signature:
| Degree | Roman Numeral | Chord Type | Chord |
|---|---|---|---|
| 1 | I | Major | Gb Major |
| 2 | ii | Minor | Ab Minor |
| 3 | iii | Minor | Bb Minor |
| 4 | IV | Major | B Major |
| 5 | V | Major | Db Major |
| 6 | vi | Minor | Eb Minor |
| 7 | vii° | Diminished | F Diminished |
Related Keys
- Relative Minor
- Eb Minor — shares the same key signature.
- Parallel Minor
- Gb Minor — same tonic, different key signature.
See all key relationships on the Circle of Fifths.
Scales in Gb Major
Common scales built from the Gb tonic:
Transposing Instrument Context
Bb instruments (trumpet, clarinet, tenor saxophone) read in Ab major to sound Gb Major. Eb instruments (alto saxophone, Eb clarinet) read in Eb major to sound Gb Major. Flat-key signatures are particularly comfortable for woodwind instruments designed around Bb and Eb transpositions.