Watch the Flat 3rd: Alt. Dom. Sound online guitar lesson by Kenny Wessel from Shades of Jazz
If we use the major b3 pentatonic built a half step above the root of an altered dominant chord, we get an interesting and very cool altered dominant scale. For instance, we can use a G major b3 pentatonic over an F#7 altered chord and we'll get the tensions - b9, #9, 3, b13, and b7 (the pitches of this scale are: G, A, Bb, D, E). This scale gives us the dominant family notes, the tritone again - 3 and b7 and some altered tensions - b9, #9, and b13. In this video segment, I'll demonstrate using this scale over a V-I progression.