Bb
Db
Eb
Bb
F#
A
E
C
G
Eb
Bb
C
Db
E
F#
Db
A
C
G
Eb
Bb
F#
Db
Eb
E
G
A
E
C
Eb
Bb
F#
Db
A
E
F#
G
Bb
C
G
Eb
F#
Db
A
E
C
G
A
Bb
Db
Eb
Bb
F#
A
E
C
G
Eb
Bb
C
Db
E
F#
Db
A
C
G
Eb
Bb
F#
Db
Eb
E
G
A
E
C
Eb
Bb
F#
Db
A
E
F#
G
Bb
C
G
Eb
F#
Db
A
E
C
G
A
Bb
Db
Eb
Bb
F#
A
E
C
G
Eb
Bb
C
Db
E
F#
Db
C Half-Whole Diminished Scale notes: C Db Eb E F# G A Bb. Formula: 1 b2 b3 3 #4 5 6 b7. Chords that fit it: C, Cm, C7, Cm7, Cdim, Cdim7, Cm7b5, C5.
The half-whole diminished scale alternates half and whole steps: 1 b2 b3 3 #4 5 6 b7. It fits dominant chords with b9 and #9, so it is a jazz and fusion staple over 7b9 chords. It is symmetric: the pattern repeats every three frets, so there are only three different ones.