Opposite to shortening the standard blues structure, there is also the option of lengthening it. By adding another 4 measures, you get a full 16-bar blues that has a sense of completion and symmetry more commonly found in classical-based music.
Below are some variations of the harmonic progression in a 16-bar framework that you can play around with:
Once again, this is just a beginning frame. You can most certainly experiment with substituting chords and changing other factors. Like how an artists needs a canvas to first structure their genius, so does a composer.
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