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Watch the Composite Blues Scale online guitar lesson by Jeff McErlain from Blues Guitar Survival Guide - Lead

The composite blues scale is basically a mixture of both the major and minor blues scales. This scale is really the holy grail for us blues players. It allows us to navigate some tricky waters. Lets look at how it works over A7. An A7 chord is spelled A–C#–E–G or R–3–5–b7. If we look at the minor blues scale we can see that it does not contain a very important note of the chord, the natural 3rd or C#. Although the scale sounds great, it does have some room to expand. A simple option to play over the A7 chord is the A major blues scale. This scale consists of A–B–C–C#–E–F# (R–2–b3–3–4–6). This scale now includes the natural 3rd (C#). The real fun starts when we mix the two scales together, as we see in the attached diagram. This is called the composite blues scale. Whoa! That’s a lot of notes to think about. Here we have A–B–C–C#–D–Eb–E–F#–G, or root–2–b3–3–4–b5–5–6–b7. That’s nine notes and a lot to think about, too much in fact. So what I recommend it to add one new note to the minor blues scale at a time. Bite size chunks is the way to go!