Second in the series of commonly-used Major 12 bar Blues variations… 
The “variation” inserts an F7 in bar 10, adding a bit harmonic motion and interest than staying on the G7…
piano-ology-blues-school-major-blues-12-bar-form-and-harmony-variation-2
Listen to Frank playing an example based on the form above (Hint: play along with the basic chords above so that you start to hear and internalize the changes)…

Audio: please specify correct url

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