A Altered Scale

A Altered Scale notes: A Bb B# C# D# F G. Formula: 1 b2 #2 3 #4 b6 b7. Chords in this scale: Adim, Bbm, B#m, C#aug, D#, F, Gdim.

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.