5 notes · the ♭3 and ♭7 · 5th mode of B major pentatonic
Natural minor without the 2nd and ♭6.
the ♭3 and ♭7
Every other note here is not a third apart, so it builds no chords. Play it over the ones below.
Chords on Ab made only of these notes.
Shows each chord the way this style would voice it, and marks which of its alternatives belong to the idiom.