Twelve-bar blues

The blues progression has a distinctive form in lyrics, phrase, chord structure, and duration.

Mastery of the blues and rhythm changes are "critical elements for building a jazz repertoire".

[1] The blues originated from a combination of work songs, spirituals, and early southern country music.

[3] The style of music heard on race records was later called "rhythm and blues" (R & B).

It is shown in its simplest form, without the common "quick change", turnarounds, or seventh chords.

A more complicated example might look like this, where "7" indicates a seventh chord: This progression is similar to Charlie Parker's "Now's the Time", "Billie's Bounce", Sonny Rollins's "Tenor Madness", and many other bop tunes.

[9] Peter Spitzer describes it as "a bop soloist's cliche to arpeggiate this chord [A7♭9 (V/ii = VI7♭9)] from the 3 up to the ♭9.