441. TWO TYPES OF 12 BARS BLUES AND THEIR MELODIC VERSIONS.

Normally the 12 bars blues have  the timing chord structure

A

1M 1M 1M 1M

4M 4M 1M 1M

5M 5M 1M 1M

But there si also a 2nd type which staye less time in the root chord and is focusing of same rimming  chord transitions which is the 

B

1M 1M 4M 4M

4M 4M 1M 1M

5M 5M 1M 1M

Now if we apply the melodic triangulation on them with intermediate minor chords in consecutive melodic relation  we get  the next melodic versions of them

A melodic

1M 1M 1M 6m

4M 6m 1M 3m

5M 3m 1M 1M

B melodic 

1M 6m 4M 4M

4M 6m 1M 3m

5M 3m 1M 1M