So far we have dealt with major chords and dominant 7th chords. Now comes another popular sound in Blues, the Dominant 9th chord (commonly called a 9th chord). A 9th chord is obtained by adding a major 3rd interval on top of a 7th chord. The chord will then contain the 1st, 3rd, 5th, b7th and 9th degress of a major scale. Here is the most common voicing of the 9th chord. The third finger should clearly sound the 1st, 2nd and 3rd strigns. The root note here is on the 5th string, under the second finger.
Once you have the shape memorised, try this new 12 bar Blues which moves the 9th chord around the fretboard. In this exercise the shape is often moved briefly up or down on fret from chord I, IV or V. Listen to the effect it creates.
Here is another common 9th chord shape. This one can sometimes be diffecult to locate correctly, since it doesn't contain the root note. The root can be found on the 6th string at the same fret as the third finger.
Once you are comfortable with each of the 9th chord shapes, try playing a 12 bar Blues alternating between the two.
