The G diminished half–whole scale has 8 notes: G, Ab, A#, B, C#, D, E and F. Its formula is 1 b2 #2 3 #4 5 6 b7 and its steps, in tones, are ½ – 1 – ½ – 1 – ½ – 1 – ½ – 1.
The half–whole diminished scale alternates a semitone and a tone: eight symmetrical notes, used in jazz over altered dominant chords.
G diminished half–whole
G Ab A# B C# D E F · 1 b2 #2 3 #4 5 6 b7
Colored dots: notes of the scale, the root is the darkest.