Gb Half-Whole Diminished Scale Notes

Degree	Name	Note	Interval
1	Tonic	Gb4	P1
2	Supertonic	Abb4	m2
3	Mediant	Bbb4	m3
4	Subdominant	Bb4	M3
5	Dominant	Dbb5	d5
6	Submediant	Db5	P5
7	Leading Tone	Eb5	M6
8	Octave	Fb5	m7
9	Degree 9	Gb5	—

Key Signature

The key of Gb Half-Whole Diminished Scale has 6 flats: B♭, E♭, A♭, D♭, G♭, C♭.

B♭E♭A♭D♭G♭C♭

These are the diatonic triads built on each degree of the Gb Half-Whole Diminished Scale:

Degree	Numeral	Chord	Quality
1	I	Gb Major	Major
2	ii	Ab Minor	Minor
3	iii	Bb Minor	Minor
4	IV	B Major	Major
5	V	Db Major	Major
6	vi	Eb Minor	Minor
7	vii°	F Diminished	Diminished