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The "12-Bar Blues" Technique
The 12-bar blues is all-American. It developed right here, and until the last few years, it's main musicians were right here in the US. I had the privilege not long ago of standing on the corner of Bourbon St. and listening to the musicians in Preservation Hall play some of the most authentic blues I've heard.
You simply play 12 measures of the same chord progression over and over, each time improvising some different melody on top of those changes. And those changes are:
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
The 7th is usually added to each chord -- so if the I chord is F, you would usually play F7 -- that is kind of assumed in the blues.
Blues 