In western music theory, a Synthetic Chord is a chord that cannot be analyzed in terms of common chord structures, such as a dominant or seventh chord.
The 12 bar blues progression, and variations on its theme, is the basis for all blues, some jazz, and many rock & roll songs. It uses all dominate 7th chords.
The Thrill is Gone by B.B. King is a masterpiece of classic blues. Below is how we play the 12 bar chord progression and pictured are the voicings we chose.
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