398. 12 bars blues with power chords

 In  this interesting twist, we do not utilize to major chords 1M 4M 5M but the power 2-notes 3 voices chords  1P 4P 5P . Where 1P=1-5-1' , 4P=4-1-4" and 5P=5-1-5'

 

Similarly as in the post   396    may substitute the 1P 4P 5P with relative power chords like  2P 3P 6P 7P 

Why we do it? Because either if we are in the natural minor of the scale or the harmonic minor or the double harmonic minor, the chords remain the same and we have stable harmonic background with very rich melodic variations and transitions to other minor chromatic scales.