by mikedodge on Mon Aug 11, 2008 12:46 pm
Part 3: Using ONE SCALE for the whole progression...
Many people first realize they can play a Minor Pentatonic or a Blues scale for the Root of the I7 chord and it'll fit over the WHOLE progression (ala using the C Blues scale for the whole Blues progression "in C"). While this IS true it's not REALLY true.
One of the biggest reasons is, both of those scales contain a m3 (the Eb note), but the I7 chord contains a M3 (the E note). So most peole develop, without realizing it usually, a slight bend to a full half-step bend placed on that m3 note. What's REALLY happening here is the m3 is being bent, or suggesting it's moving, to the M3 (moving the m3 to the M3, IOW Eb->E)!
This is at the heart of "playing the Blues". You've heard (and probably played) this bend SO MANY times that you'd probably be in debt a million dollars if you had to pay a penny for every 100 times you've heard or used it. But, because it sounds SO good (especially compared to "sitting on" the m3/Eb) that you would continue to go in debt to keep using or hearing it.
So, in reality the m3 in the scale is not necessarily a note of choice over the I7 chord, but a tension, or a path, used to get us to the M3...AND get us closer to sound like we are actually playing over a Major chord instead of a Minor chord that doesn't exist!!!
Also, the F note (the Perfect 4th, or 11) in C Blues scale doesn't sound especially sweet over the C7 chord, so this is why we have the common, and very much over used, bend from F->G when many people start their solo's with or find in the common Blues riffs based on bends. That F is tension and it resolves to the G note because...wait for it...G is IN the C7 chord!!!!
In conclusion...when using the C Blues scale over the I7 chord, realize you can now add in the M3 note to the scale to make it "fit the chord" better. And have that common bend from F->G because F isn't in the chord but G is in the chord, so again you are making things "fit the chord" better.