Watch the Level 4: Blues Chord Melody online guitar lesson by Jason Loughlin from Take 5: Blues Chord Melody
This etude is over a 12-bar blues in A. In the last four bars, we're playing the V chord for the first two bars. There is no V|IV progression in the last four. The turnaround is I|bIII|II|bII. We'll be harmonizing each of these chords with Dom 7th shapes. To recap, the last four bars will sound as V|V|I-bIII|II-bII.