What Scales To Play Over 12 Bar Blues

Learn how to solo over 12 bar blues, and how to switch to the right scales, at the right place on the guitar fretboard.

Following The Chord Changes In 12 Bar Blues

When you try to improvise over any 12 bar blues chord progression, you will be very limited in your playing if you can't follow the chord changes. If you need to keep looking at the lead sheet, and calculating how long to stay on each scale before switching, inspiration and creativity will suffer.


In this lesson I will show you how to practice, so that you will get to the point where you will feel just as comfortable switching scales over a 12 bar blues as if you were playing a single scale. The scale changes will become automatic and transparent, so that your creativity can take over.

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Video: Scale Choices For 12-bar Blues

The Easy Way Out - Using A Single Blues Scale

Before we get into it, I need to point out something about blues that you may, or may not already know:

You can play the minor pentatonic or blues scale of the key over a blues tune, without following the chord changes, and it will still sound great.

This is an example of what we call "harmonic simplification". In fact, many wonderful blues players use this almost exclusively. For example, you can play the G Minor Pentatonic / Blues scale over all chords of a 12 bar blues in G.

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Step 1 - Choose Your Blues Scales

If you look on the surface, you may think that playing a single scale should not sound good, because basically you are playing a minor scale over major chords. But if you look closely, there are harmonic reasons why it works so well. I can’t get into them right now, but maybe I will do a lesson on that in the future. The reason I pointed this out is because for every chord in our Blues in G example, we will have a second scale option, the G minor pentatonic or blues scale.


So let’s look at the form of a simple blues in G (look at the pic below). The first 4 bars are G7, so according to what we have learned, the appropriate scale is G major pentatonic. In addition to that, we have the  G minor as a second option. For now I will choose the G major. Then we have C7 for 2 bars. Our options here are C major pentatonic, and again G minor. I will choose the C major. Then 2 bars of G7 again, so I will return to the G major pentatonic. The last 4 bars of a 12 bar blues are called the “turnaround”, and in most variations of blues it’s the most harmonically busy section. We have one chord per bar in this case. So let’s say that I’m lazy and want to take the easy road. In that case I choose the G minor pentatonic over all of them. So here’s my plan: 4 bars of G major, 2 bars of C major, 2 bars of G major again, and then 4 bars of G minor.

Scale Choice Example 1 for Blues in G
Scale Choice Example 1 for Blues in G
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Step 2 - Memorize the plan

This brings us to our second step. We need to memorize this plan. If you are into theory and understand the functions of these chords, there are different ways that you can label these progressions in order to remember them. But let’s stick to a simple approach: If remembering the whole plan is too much, then break down, and practice in 4 bar sections. You probably don’t need to do that for a blues, but you may need to later when we apply this on a more complex tune, so we’ll talk more about it then.


Your job in this step is to put on a backing track, and on the first beat of every bar, play the root and say the name of the scale, without looking at the song lead sheet. It’s important to do this on every bar so that you develop your sense of how the form flows.


Keep in mind that the root of the minor pentatonic can sound strange over some chords in the turnaround, but that’s just when you sit on the root for a long time as in this exercise. In the next parts you will hear that the minor pentatonic sounds just fine.


Note: In the video example I show you the lead sheet so that you understand what I’m doing, but the point is to do this without looking. So once you can do this by heart, then you can go to the next step.

Step 3 - 12 Bar Blues Scale Practice

The 3rd step is to play the scale whenever the scale changes. In songs with quicker chord changes you can just play just a part of it, but here we have time to play the whole thing.

In the video example I do it first ascending, and then descending, as always without looking at the lead sheet.

Note: The examples in this video are played using SFS (String Fragment System) fingerings in a single fretboard area (frets 5-8). Feel free to apply the process to any fingerings you like.

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Step 4 - 12 Bar Blues Improvisation

The 4th and last step is to use these scales to improvise, again without looking at the chord changes.

In the video I play you an example in the area where we were working on, but then the second time around, the second 12 bars, I use a different group of scale options according to this 2nd plan below, so that you can check out a different variation. So I start the same, with G major for 4 bars, but then move to G minor for the next 4 bars, over both C7 and G7, and then I use a single scale for each of the chords in the turnaround:

Scale Choice Example 2 for Blues in G
Scale Choice Example 2 for Blues in G
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I think you are starting to get the point. According to what you want to achieve, you can do this in different fretboard areas, with different options, and so on.

Some players like to choose just a couple of areas (maybe one high and one low) and concentrate on those, and try to sound as good as possible. They may compose a few nice licks to have handy, and so on.

Others, like me, like to explore every possible option, so I would spend a lot of time on this, and thoroughly cover every area and every mathematical possibility.

But I’m mainly a teacher and a kind of guitar nerd that likes to research all the time. You don’t have to be like me. There are amazing players out there that know just a small fragment of what I know, but still sound a hundred times better because of imagination, and feel, and talent, and all that good stuff :-)

So take what I give you and find ways to use it that accommodate your own personal style and character. Whatever you choose to do, remember that this skill requires some time and patience, so don’t give up. I have included the Blues in G backing track below, for you to practice over, but at the end of the course you will have all the information you need to take this and apply it on any song you want.

So have fun and I’ll see you in the next lesson where we will tackle a more involved tune with some different scale requirements.

Prokopis Skordis

Blues in G Backing Track

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