I have a simple question for you: Can you write down the 12-bar blues chords from memory?
I’ve noticed that so many guitar students struggle with this, even after they’ve played the progression a thousand times. In reality, all of those fancy chord extensions, rhythmic flourishes, and soloing tricks are just "ornamental"—the icing on the cake.
The chord changes are what truly matter. Whether you’re practicing at home in Milton or preparing for a jazz jam session in Roswell, mastering these progressions makes you a more confident musician. You’ll be free to experiment and take risks because you’re not chasing the chords—you’re leading them.
Understanding the "Big Three" (I - IV - V)
To play the blues in any key, you only need to know three chords based on the scale of that key. We use Roman Numerals to track them:
I (The One): Your "Home" chord (e.g., E7 in the key of E).
IV (The Four): The "Departure" chord (e.g., A7 in the key of E).
V (The Five): The "Tension" chord that leads you back home (e.g., B7 in the key of E).
Memorize these five common keys so you can jump into any local jam session or gig without feeling uneasy:
Key of E: E7 (I) — A7 (IV) — B7 (V)
Key of A: A7 (I) — D7 (IV) — E7 (V)
Key of G: G7 (I) — C7 (IV) — D7 (V)
Key of C: C7 (I) — F7 (IV) — G7 (V)
Key of D: D7 (I) — G7 (IV) — A7 (V)
Look at this "Quick Change" 12-bar blues in the key of E. Each chord represents one bar (4 beats):
E7 — A7 — E7 — E7
A7 — A7 — E7 — E7
B7 — A7 — E7 — B7
Keep in Mind :Sometimes the first four bars stay on the "home" chord (E7 - E7 - E7 - E7) and sometimes the last line will hold the V chord for two bars (B7 - B7 - E7 - E7). There are many variations, but you need the basic form memorized.
Lead the Chords, Don't Chase Them
Once you have these chords memorized, you can finally relax and focus on your rhythm and soloing. You’ll be able to anticipate the change in your solo using a slide, a bend, or a melodic walk-up.
Whether you're practicing at home in Alpharetta or prepping for a session in Buckhead, mastering these changes makes you an invaluable collaborator. You’ll be free to experiment and take risks because you’re not just following the chords—you’re leading the conversation.
Get a piece of paper right now and jot down the 12-bar blues in a random key (try C or D). Then, check the reference list above to see if you got it right.
You’re on your way!
— Dan Dresnok
Guitar Instructor | North Atlanta & Nationwide
NWGA Guitar
About the Author: Dan Dresnok | NWGA Guitar
Dan is a professional jazz guitarist and the founder of NWGA Guitar, specializing in improvisation, advanced theory, and the blues. Based in the North Atlanta metro, Dan provides premier online guitar lessons to students in Alpharetta, Milton, Johns Creek, and nationwide. By teaching exclusively via a professional online studio, Dan helps dedicated guitarists master the instrument from the comfort of their own homes while providing the elite, one-on-one attention of a high-caliber instructor.
