From danforcz@yahoo.com Thu Dec 11 20:31:27 2014
Subject:Re: Live vr09 tracks vs SK1

Simply said: blues is a combination of European (Western) major
harmony with African minor pentatonic scale in the melody (some
additional notes are possible, like 2, 4+, 7maj).
Melodic patterns have mostly descending, shouting character.
So in the result we can get those typical chords written as X9+, but
in fact tone used in the melody is not 9+, but 10- (minor third
against major third in the harmony).

It's possible to use only one minor pentatonic scale (also with
additional notes) for all main three accompanying chords in the key
(tonic, subdominant and dominant), it's just necessary to avoid some
notes on main beats, for example:
C7 - use C, Eb, G, Bb (and F#), avoid F
F7 - use C, Eb, F, G (and F#), avoid Bb
G7 - use Eb, F, G, Bb (and D, F#, B), avoid C
Of course avoided notes can be used as passing or neighboring notes.
Avoided notes are always interval of fourth from the root note of the
chord.

Another possibility is to change melodic scale together with the
change of chord. Then we can play C minor pentatonic (with additional
notes) on C7, F minor pentatonic on F7, G minor pentatonic on G7. But
blues can have more complex chord progressions.

Daniel Forro