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Watch the The Roadmap: Blues Scale online guitar lesson by Robbie Calvo from Power Play: Dominant

The chord progression that we’ll be playing over in this section is an altered dominant progression and has a tonal center that resolves to the #9 chord at the beginning of each 2 bar phrase. We'll be improvising with the blues scale over this progression in 4 different keys. Each key lasts for 8 bars.

Check out the new chord progression first and then make a note of the four key changes.
Here are the four altered dominant chord vamps you’ll be playing over - D7#9 - E7#9 - F#7#9 - A7#9. This sequence will cycle 4 times.

The blues scale works over this altered dominant progression beautifully because the #9 in the chord is enharmonic to the minor 3rd interval in the blues scale. This means that you’ll be able to target that nice dissonant #9 note with a saucy sweet note resolution.