Theory only matters when it makes it into your playing. This lesson takes the three pentatonic sounds you’ve learned — dominant, Dorian, and altered — and shows you exactly how they map onto a 12-bar blues, bar by bar, so you have a clear and practical framework to work from immediately.
What you’ll get out of this lesson: A detailed bar-by-bar breakdown of how to apply the dominant, Dorian, and altered pentatonic scales across a 12-bar blues in E, giving you a concrete road map to practise from.
The 12-bar breakdown — bar by bar
Bar 1 — Open on the dominant pentatonic to play strong, clear sounds that outline the key. This is your home base.
Bar 2 — The quick change brings in A7. Switch to the E Dorian pentatonic: its major 6th and flat 3rd are chord tones of the A7, so this scale fits the IV chord far better than the standard minor pentatonic.
Bar 3 — Back to strong tonic sounds with the dominant pentatonic.
Bar 4 — E7 is a dominant chord resolving forward, so you can introduce the altered sound to add tension to that resolution. Consider introducing it on beats 3 or 4 rather than the whole bar — sustained outside sounds can be hard to control and even harder to resolve convincingly if overdone.
Bars 5, 6, 7, 8 & 9 — Follow the dominant chords with the dominant pentatonic. Keep it grounded and musical here.
Bar 10 — A7 returns. Incorporate the Dorian pentatonic as in bar 2 to outline the IV chord harmonically while staying in the key of E.
Bar 11 — Move to the simple minor pentatonic. Coming from the Dorian pentatonic in bar 10 this is a smooth transition — you’re just removing the major 6th — and it sets up a clear, strong tonic feel going into the turnaround.
Bar 12 — The turnaround. Add tension with the altered sound to propel the ear back to the top of the form.
Taking it further: Once you’ve worked through this framework in E, transpose the whole approach to another key — A or G are good starting points. Experiment with introducing the altered sound earlier in a bar, or swapping the minor pentatonic in bar 11 for the Dorian pentatonic to see how the voice leading feels. As you get more comfortable, the goal is to internalise when each scale fits rather than thinking bar by bar.
Your homework: Find a 12-bar blues backing track in E and work through the framework bar by bar, referring to the diagram above. Play through it slowly at first, switching scales at the correct moments. Do at least three full runs through the 12 bars, then try a fourth without consulting the guide and see how much you can recall from memory.