Blues Chord Progressions

The 12-bar blues is not just a progression - it is the skeleton of an enormous amount of music. Rock and roll grew out of it. R&B, country, and funk all borrow from it. Learn to play a solid 12-bar blues and you can sit in with other musicians, understand what experienced players are doing, and see how most popular music works at the harmonic level.

Every chord in a standard 12-bar blues is a dominant 7th chord. That is unusual - in most keys, there is only one natural dominant 7th. The blues uses three. That clash of 7th chords is part of what gives blues its gritty, unresolved energy.

The 12-Bar Structure

In the key of A, the three chords are A7 (the I chord), D7 (the IV chord), and E7 (the V chord). The standard 12-bar sequence goes:

1. Bar 1: A7
2. Bar 2: A7
3. Bar 3: A7
4. Bar 4: A7
5. Bar 5: D7
6. Bar 6: D7
7. Bar 7: A7
8. Bar 8: A7
9. Bar 9: E7
10. Bar 10: D7
11. Bar 11: A7
12. Bar 12: E7 (the turnaround - sends you back to bar 1)

The key of A is guitar-friendly for blues because the open strings are in your favor. A7 and E7 have comfortable open-position voicings, and D7 sits naturally on the middle strings. Many famous blues tracks are in A or E for exactly this reason.

The Quick Change

A common variation on the standard 12-bar is called the quick change. In bar 2, instead of staying on A7, you go to D7 for one bar and return to A7 in bar 3. It sounds like this:

1. Bar 1: A7
2. Bar 2: D7 (the quick change)
3. Bars 3-4: A7
4. Bars 5-6: D7
5. ...rest of the 12-bar as usual

The quick change adds momentum to the first four bars and is used in a huge number of standard blues progressions. If you are playing with other musicians, the convention is to call it out: "quick change in two" means bar 2 goes to the IV chord.

Shuffle Feel and Rhythm

The 12-bar structure is only half the picture. Blues rhythm is based on a shuffle: a long-short pattern within each beat. Instead of dividing the beat into two equal eighth notes, a shuffle gives the first eighth note roughly twice the length of the second. Written out: DUN-da, DUN-da.

The most common blues guitar rhythm pattern is the movable two-string riff on the 5th and 6th strings, alternating between the root-5th and root-6th intervals. This pattern moves with the chord changes and forms the backbone of Chicago-style blues guitar.

Practice the shuffle rhythm on a single A7 chord before applying it to the full 12-bar. Count: "one-and, two-and, three-and, four-and" with the emphasis on the downbeats and the "and" slightly rushed into the next beat.

The Turnaround

Bar 12 of the 12-bar blues is the turnaround. Its job is to create tension that pulls the listener back to bar 1 when the progression repeats. The simplest version is just E7 for the full bar. More elaborate turnarounds use a chromatic descending line in the bass or a series of chords.

A common two-bar turnaround (bars 11-12): A7 for two beats, then a chromatic walk down the bass strings A - Ab - G - F#, landing on E7. This walk is one of the defining sounds of blues guitar and worth spending time on once the basic 12-bar is comfortable.

Practice Exercise

Play the 12-bar blues in A at a slow, steady tempo. Use a metronome or drum machine. One strum per chord change is enough to start - do not worry about rhythm patterns yet.

1. Count four bars of A7. Strum on beat 1 of each bar.
2. Count two bars of D7.
3. Count two bars of A7.
4. One bar of E7.
5. One bar of D7.
6. One bar of A7.
7. One bar of E7 (turnaround).
8. Repeat from the top without stopping.

Once you can cycle through without hesitation on the changes, add a simple strum pattern. Then try the quick change in bar 2. The 12-bar is a structure you can keep developing for years - what matters now is internalizing the form so you know where you are at every point in the cycle.

Next up: Jazz Chords: ii-V-I