Hello again. I really like the flexibility that the blues scale gives to improvising on the piano. The key of C is easy to remember but you will discover great improvement in your playing if you practice the blues scale in other influential keys. Practice it in C, Ab, Bb, Eb. If you accompany guitarists, favorite keys seem to be E, A and G so those are good ones to learn as well. This particular video by Drew Roberts of Making Music Magazine is basic, but in its simplicity really drives home the most important concepts.
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