You should always analyse the scale in terms of the underlying harmony. The jazz blues chord progression contains more complex harmony including both the major 251 progression and the minor 251 progression. In the next lesson we are going to enhance the basic 12 bar blues changes with the jazz blues chord progression. Remember that this is the simplest and most basic of all blues forms but it’s important to understand & internalize this sequence before adding more chords into the progression. On the 3rd line, we have 1 bar of the V chord which is C7, 1 bar of the IV chord which is Bb7 and then a final 2 bars of the I chord (F7) to finish the form. On the second line, we have 2 bars of the IV chord which is Bb7 and then back 2 bars of the I chord which is F7. In the simple blues, this lasts for the whole line which is 4 bars, or a third of the entire progression. We start off in bar 1 with F7 which is the 1 chord. The structure of the blues form is the same in any key so it’s important that you understand it numerically as this will give you the blueprint to find the chords no mater what key you are playing in. In the simple 12 bar blues we play all of these chords as dominant 7th chords so the three chords we will be using are F7, Bb7 and C7. The I chord is F, the IV chord is Bb and the V chord is C. If we analyse the chords numerically, this is what we get: Also notice that all of these chords are dominant chords. In the basic F Blues, the 12 bars are only made up of 3 different chords: F7, Bb7 and C7. Most jazz standards are 32 bars long and so the blues form is less that a third of the length of a typical jazz standard. It’s called the 12 bar blues because it’s only 12 bars long. You will also find blues written in other keys but these two are by far the most common.
This is because the flat keys are preferred by horn instrumentalists such as the sax and trumpet players. The blues is most commonly played in the keys of F, Bb & Eb. It’s important to understand that the 12 bar blues is a cycle and it is repeated many times during a performance. In it’s most basic form, it contains just the I, the IV and the V chords of the given key. The 12 bar blues is the most common blues chord progression. The extended and altered tones add colour and texture to our dominant chord voicings. We will then explore some different ways you can voice the chords using our knowledge of rootless chord voicings and left hand voicings.Ī rootless voicing (also known as left hand voicing) is when we omit the root from the chord which frees up a finger to play chord extensions or chord alteration. We will start off right at the beginning, talking about what the 12 bar blues is, how it is constructed, and how it is played. This is the first lesson in our study of the 12 bar blues.
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