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create a 12-bar blues pattern in the key of a.
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the twelve-bar blues pattern in the key of a is: a-a-a-a-d-d-a-a-e-d-a-e. it begins with four bars of the i chord (a), followed by two bars of the iv (d), back to two bars of the i chord, one bar of the v (e), another two bars of the iv, and finally two bars of the v. this repeating pattern can be used when writing and playing a musical composition in the blues style.
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