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The twelve-bar blues (or blues changes) is one of the most prominent chord progressions in popular music. The blues progression has a distinctive form in lyrics, phrase, chord structure, and duration. In its basic form, it is predominantly based on the I, IV, and V chords of a key.
Although there are many possible progressions, in practice, progressions are often limited to a few bars' lengths and certain progressions are favored above others. There is also a certain amount of fashion in which a chord progression is defined (e.g., the 12-bar blues progression) and may even help in defining an entire genre. [citation needed]
IV-V-I-vi chord progression in C major: 4: ... Twelve-bar blues: ... This page was last edited on 18 January 2025, at 12:16 (UTC).
Steedman (1984) [1] has proposed a set of recursive "rewrite rules" which generate all well-formed transformations of jazz, basic I–IV–I–V–I twelve-bar blues chord sequences, and, slightly modified, non-twelve-bar blues I–IV–V sequences ("rhythm changes"). The typical 12-bar blues progression can be notated
The use of the flattened seventh may lend this progression a bluesy feel or sound, and the whole tone descent may be reminiscent of the ninth and tenth chords of the twelve bar blues (V–IV). The progression also makes possible a chromatic descent across a minor third: ^ – ♯ ^ – ♮ ^ – ^.
It can be played for the entire duration of a twelve bar blues progression constructed off the root of the first dominant seventh chord. For example, a C hexatonic blues scale could be used to improvise a solo over a C blues chord progression. The blues scale can also be used to improvise over a minor chord.
Instead of extending the first section, one adaptation extends the third section. Here, the twelve-bar progression's last dominant, subdominant, and tonic chords (bars 9, 10, and 11–12, respectively) are doubled in length, becoming the sixteen-bar progression's 9th–10th, 11th–12th, and 13th–16th bars, [citation needed]
Be they in major key or minor key, such I–IV–V chord progressions are extended over twelve bars in popular music—especially in jazz, blues, and rock music. [36] [37] For example, a twelve-bar blues progression of chords in the key of E has three sets of four bars: E–E–E–E7 A–A–E–E B7–A–E–B7;