12-Bar Blues — Musical Full-Chorus Examples

A 12-bar blues is a repeating 12-measure form built mainly from the I7, IV7, and V7 chords.

In E, that means E7, A7, and B7. The examples above break the form into short player-friendly chunks, add an engraved bass line, show the quick-change variation, a minor-blues ending, transpositions to A and G, and isolate bars 11–12 so you can clearly hear the turnaround function.

The core idea is simple: bars 1–4 establish I7, bars 5–8 move to IV7 and back to I7, and bars 9–12 create the tension-and-return section. In the most common ending, bars 11–12 are I7 → V7, which resolves the current chorus while the V7 pulls you straight back into bar 1.