Maybe you have already heard the term “12-bar blues” before. On the other hand, maybe not. Anyways, as a little tip: you can use the 12-bar blues form as a beginning step to form the structure and harmonic progression of you musical composition.
The reason why it is called 12-bar blues is because… it takes place over 12 bars of measures and is commonly found in the blues style. Shocking, I know.
Below is the most common use form and harmonic progression of the 12-bar blues. Notice how each of the chords in the measure spaces are dominant chords, regardless as to if they are the I, IV, or V of the key.
Once again, this is just a beginning frame. You can most certainly experiment with substituting chords and changing other factors. Like how an artists needs a canvas to first structure their genius, so does a composer.
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