This lesson is about tension and resolution
Tension in music allow us to bring the listener into an uncomfortable place. Resolution allow us to bring them back home.
On a 12 bar blues that tension happens on the fifth degree.
To keep the listener engaged while we go into tension we need to establish an element of trust. That could be a consistent rhythm pattern or the use of a symmetrical scale like the whole tone scale or the diminished scale (those are consistent because they have a logical sequence).
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