C# Half-Whole Diminished Scale

C# – D – E – E# – G – G# – A# – B – C#

Formula:H-W-H-W-H-W-H-W

Intervals:P1-m2-m3-M3-d5-P5-M6-m7

C# Half-Whole Diminished Scale Notes

Degree	Name	Note	Interval
1	Tonic	C#4	P1
2	Supertonic	D4	m2
3	Mediant	E4	m3
4	Subdominant	E#4	M3
5	Dominant	G4	d5
6	Submediant	G#4	P5
7	Leading Tone	A#4	M6
8	Octave	B4	m7
9	Degree 9	C#5	—

The key of C# Half-Whole Diminished Scale has 7 sharps: F♯, C♯, G♯, D♯, A♯, E♯, B♯.

F♯C♯G♯D♯A♯E♯B♯

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

Degree	Numeral	Chord	Quality
1	I	C# Major	Major
2	ii	D# Minor	Minor
3	iii	F Minor	Minor
4	IV	F# Major	Major
5	V	G# Major	Major
6	vi	A# Minor	Minor
7	vii°	C Diminished	Diminished