12 Bar Blues Progression

The standard 12 bar blues progression, and variations on its theme, is the basis for all blues music, some jazz, and many rock & roll songs. A classic example of a blues rock song would be "You Shook Me" by Led Zeppelin.

The progression is composed of the I, IV, & V chords in any key. These chords are all dominate 7th chords. The progression is:

4 bars of the I chord
2 bars of the IV chord
2 bars of the I chord
1 bar of the V chord
1 bar of the IV chord
2 bars of the I chord

So in the key of C, for example, it would be:

C7 C7 C7 C7
F7 F7 C7 C7
G7 F7 C7 C7

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