The next time you're looking for a way to juice up your
blues line, try this: Pick a blues scale, and then combine
it with the blues scale located a minor third (three frets)
below. As you’ll see, this composite blues scale can be
used in several ways.
Let’s begin with a regular
C blues scale (C, Eb, F, Gb, G, Bb,
or 1, b3, 4, b5, 5, b7). Dipping a minor third below gives
us an A blues scale (
A, C, D, Eb, E, G). Now if we absorb
A blues scale into the C blues scale, we get a colorful
C  composite blues scale: C, D, Eb, E, F, Gb, G, A, and Bb
(see the charts on p. 145). In addition to the C blues
scale’s six tones, we get the 9 (
D), 3 (E), and 13 (A).  That’s
a total of nine notes -- a plentiful palette.

Shared roots. Ready to dig into some deep chord/scale
relationship? (To streamline the process, bear in mind
that we’ll sometimes spell a scale tone or chord tone
enharmonically. That is, we’ll use
C instead of  B#, or
A# instead of Bb. Despite the name change, the
note is the same.)

Composite scales sound great played over dominant
chords built from the same root. Try
EX.1, which features
C composite line played against C7. Alternatively, you
could use
C9 or C13 as background harmony.In EX.2, we
drop an E composite blues (
E, F#, G, G#, A, Bb, B, C#, D)
over an
E7#9 (E-G#-B-D-G, or 1-3-5-b7-#9). This is a
perfect application for the composite blues scale. To
liven things up, let’s toss in two chromatic passing tones
-- the 7 (
D#) and #5 (B# or C).

It’s not unusual to hear jazz players such as George Benson
and organist Jimmy Smith play a composite blues over a
major - 7th chord from the same root -- despite the fact that
the scale has
ab7, which can clash with the chord’s #7. To hear the effect, try
EX.3 -- an Eb composite blues (Eb, F, Gb, G, Ab, A, Bb, C, Db) line against Ebmaj7  
Eb-G-Bb-D or 1-3-5-7). Sometimes “wrong” is funky!

Offset tricks. You can play a composite blues scale over other chord types, too.  
The trick is knowing how to offset the scale root in relation to the chord root in
relation to the chord root. (It can be tricky to work out these associations, so be
patient and go slowly.) For Instance, over a minor 7th  chord, play the composite
scale located a fourth higher. To improvise over
Dm7 (D-F-A-C or 1-b3-5-b7),
for instance, you’d play a
G composite blues scale (G, A, Bb, B, C, Db, D, E, F).
Notice how, in addition to
Dm7’s chord tones, the G composite blues scale
G, Bb, B, Db, and E. If you relate these notes to Dm7, you get the 4 (G),
#5 (
Bb or A#), 6 (B), 7 (Db or C#), and 9 (E). EX.4 is a G  composite blues line
played against

More offsets. Here’s another way to use the composite blues scale: When
you encounter a major 7, move up a fifth from the chord’s root and play a
composite blues scale. For example, to improvise over
Amaj7 (A-C#-E-G#
or 1-3-5-7), grab an E composite blues pattern. Along with Amaj7’s chord
tones, the scale provides
F#, G, Bb, B, and D. Against the backdrop  of Amaj7,
this translates as of 6 (
F#), b7 (G), b9 (Bb), 9 (B), and 11 (D). To experience
the colors of this offset formula, play

You can play a composite blues scale over a
min7b5 if you begin the scale
a minor sixth above the chord’s root. To solo over
F#m7b5 ( F#-A-C-E or
1-b3-b5-b7), for instance, play a D composite blues scale, which provides
the chord tones for
F#m7b5, as well as D, F, G, Ab, and B. Using several
enharmonic equivalents, this translate as b6 (
D), 7 (F), b9 (G), 9 (G#), and
11 (
B). EX.6 demonstrates  this sound.

Recycle. The offset approach may seam like a lot of work -- and it is a
challenge to think in these terms. But there is a major benefit: Once you’ve
mastered a few composite scale fingerings, you can use each pattern in
numerous ways -- thanks to offsets. The more opportunities you have to
use a given fingering, the more effective it becomes. It’s recycling, applied
to guitar. Guitar Player Magazine / January 2001 Issue
The Composite Blues Scale - Jean Marc Belkadi

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