The basic harmonic triad of major chords in a diatonic scale is used in blues (12 bars blues or not)
A chromatic variation-pertrubation (similar to that in the previous post 471) is to shift by a simitone up the 5M and 4M, to 5#dim7 and 4#dim7 respectively .
The 4#dim7 resolves to 5M, while the 1he 5#dim7 resolves to 1M
Alternative resuotuion to 1M is also the 5aug to 1M or 5M7->5aug->1M.
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