This is the first in a short series of lessons devoted to playing bass on a 12 bar blues. I’ll be covering Blues Rock and Jazz Blues in upcoming lessons.

Please Note: On this video the backing track has a very full sound and the bass can sound a little overpowered on smaller speakers. If you have problems hearing it be sure to use either headphones or larger speakers (desktop etc.)

The Twelve-Bar Blues

Many styles of music, ranging from pop to jazz, use a common chord progression called the twelve-bar blues. It is really important to learn this sequence and develop a good feel for it. Once you have it firmly memorised, you’ll have the advantage of instantly knowing hundreds of thousands of songs based on this progression.

The general progression for the Twelve Bar Blues is as follows:

Learning the sequence by number helps with moving to different keys.

For now, we will only be using chords I, IV and V. It is important to know those particular chords in every key as they are so common and are used in 99% of tunes you hear. You might get other chords in there, but I, IV and V are the main chords of the key. They are sometimes called primary chords.

Blues Progression in C

To understand the chords within a key by number, first you need to learn the Major scale. Here is a simple fingering for a C Major Scale:

Next we can number the notes of the Major Scale from 1 to 7:

Using this number system we can easily find the chords 1, 4 and 5:

  • Chord I – C
  • Chord IV – F
  • Chord V – G

The beauty of knowing chords by number is that we can easily move keys.

To find chords I, IV and V in Ab for example, then we would simply count up through the Ab major scale:

Ab Bb  C  Db  Eb  F  G
 1     2    3        6   7

  • Chord I – Ab
  • Chord IV – Db
  • Chord V – Eb

We can also use basic intervals to quickly calculate the chords within a key. A perfect 4th from the root with take you to chord IV and a perfect 5th will take you to chord V:

Chord Extensions

In blues, I, IV and V are normally played as dominant chords, which contributes to the classic blues sound. To make each chord dominant, we simply take the triad and add a minor 7th.

Chord I – C E G Bb – C7
Chord IV
F A C Eb – F7
Chord I
 – G B D F – G7

This may seem confusing to those of you with a knowledge of diatonic harmony. Normally, the chords in the key of C major would be as follows:

Chord I – C E G B – C Maj 7
Chord IV
F A C E – F Maj 7
Chord I
 – G B D F – G7

This goes against standard diatonic harmony so don’t think about it too hard! The main reason we make every chord dominant is so we can take that bluesy sound and move it around.

C Blues Bass Line

Here is a simple bass line for the twelve-bar blues in the key of C:

Practice Track:

Adding Interest

Although practical, playing root notes like this can become a little tedious. We can make use of simple melodic devices to add some interest. First of all, let’s have a look at a basic chromatic approach from chord I to chord IV:

Here we are using a double approach to lead into the F. Try adding this lead into the chord progression between chords I (C) and IV (F).

We can also use chromatic approaches from two notes above or below the next chord, (this works for every single chord in there). Here is one example of approaching the F in this way:

Here is the approach from below:

Transposition

Learning progressions by number makes it easy to transpose a song to any key. As an example, we’ll transpose the twelve-bar blues into the key of F.

First of all we need to count up the F major scale to find the root notes.

G  A  Bb  C  D   E
1   2   3   4    5   6   7

  • Chord I – F
  • Chord IV – Bb
  • Chord I – C

We know that every chord must be dominant as we are playing in a blues style so the notes of each chord would be as follows:

  • F7 – F A C Eb
  • Bb7 – Bb D F Ab
  • C7 – C E G Bb

Blues In F

Practice Track:

Blues Riffs

In blues, the bass will often play a steady, repeating riff made up of the notes of the chord in use. You’ll hear these riffs in loads of different songs so just listen out for them and learn as many as you possibly can. They are a great way to get to grips with this style and are handy for blues jams.

Here’s an example of a simple Blues Riff:

This uses degrees 1, 3, 5 and 6 of the major scale. We can transpose this to the key of F to find the notes we need to play this riff over our F7 chord:

If we play this riff over chords I, IV and V, we can play through the whole progression as follows:

Practice Track:

To spice this up a little, we can add a sneaky little triplet… (B.B. King fans will recognise this from his song Paying The Cost To Be The Boss).

Twelve-Bar Blues Variations

There are many variations on the twelve bar blues progression that can become quite far removed from the original. For now, we are going to concentrate on two simple variations.

Variation #1

Our first variation makes use of an additional chord IV in the second bar and again in the tenth bar:

Practice Track:

Variation #2

The second variation is the same as the first, but we return to chord V (G7) for the last bar:

Practice Track:

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