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12-Bar Blues: What is it?
The below progression is exactly the same as the previous one, except that it is now in the key of A. That means that instead of using E7-A7-B7 as our I-IV-V, we are now using A7-D7-E7.
With only four chords, you can now play along with hundreds of blues songs!!! Aren't you sorry that you wasted time learning your major chords before learning your seventh chords?