C Altered Scale

Bb
Db
Ab
D#
Bb
F#
E
C
D#
Bb
C
Db
Ab
E
F#
Db
C
D#
Bb
F#
Db
Ab
D#
E
E
C
Ab
D#
Bb
F#
Db
E
F#
Bb
C
Ab
D#
F#
Db
Ab
E
C
Bb
Db
Ab
D#
Bb
F#
E
C
D#
Bb
C
Db
Ab
E
F#
Db
C
D#
Bb
F#
Db
Ab
D#
E
E
C
Ab
D#
Bb
F#
Db
E
F#
Bb
C
Ab
D#
F#
Db
Ab
E
C
Bb
Db
Ab
D#
Bb
F#
E
C
D#
Bb
C
Db
Ab
E
F#
Db

C Altered Scale notes: C Db D# E F# Ab Bb. Formula: 1 b2 #2 3 #4 b6 b7. Chords in this scale: Cdim, Dbm, D#m, Eaug, F#, Ab, Bbdim.

The altered scale (super Locrian) keeps the root, 3 and b7 of a dominant chord and alters everything else: 1 b2 #2 3 #4 b6 b7, that is b9, #9, #11 and b13. Jazz players use it over a dominant chord that resolves, like G7alt to C. It is the seventh mode of melodic minor: G altered uses the notes of Ab melodic minor.