The B diminished half–whole scale has 8 notes: B, C, D, D#, F, F#, G# and A. 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.
B diminished half–whole
B C D D# F F# G# A · 1 b2 #2 3 #4 5 6 b7
Colored dots: notes of the scale, the root is the darkest.