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BL 1.1 - Twelve Bar Blues Format
The Blues is the most important and most popular form in Jazz and Jazz related music styles. It consists, in its most common present day form, of 12 bars, subdivided into three 4 bar phrases.
In the traditional vocal style :
- the 1st 4 bar phrase makes a statement :
"From dawn to dusk I work the fields all day ......"
- the 2nd 4 bar phrase repeats the statement :
"Yeah, from dawn to dusk I work in the fields all day ...."
- the 3rd 4 bar phrase completes or resolves the statement :
"But when the sun goes down I rush home to sweet Mae."
Repeated phrases are also common in instrumental blues, although it is not essential.
The basic Blues harmony consists of three chords, the I, IV and V chord.
These are the primary triad chords, built on the 1st, 4th and 5th of the major scale in any key.
The three primary triads in the key of C are :
Audio 1.1
Here is the chord progression for the Blues in C :
Audio 1.2
Here is the Blues chord progression in chord numbers as it applies to any key :
Audio 1.2
(for Blues in C)
| I
| | I
| | I
| | I
| |
|
| IV
| | IV
| | I
| | I
| |
|
| V
| | V
| | I
| | I
| :||
|
(The Chord number indicates the scale tone of the major scale on which the chord is built.)
The above chord sequence (chord progression) is typical for the blues and easy to memorise :
The last 2 bars of each (4 bar-) phrase are all harmonised by the same I chord.
The differences occur in the first two bars of each phrase.
- The I chord covers the first 2 bars of the first phrase.
- The IV chord covers the first 2 bars of the second phrase.
- The V chord covers the first 2 bars of the last phrase.