Blues, Jazz

Jazz blues is a musical style that combines jazz and blues. more...

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The term also refers to any tune that follows the standard 12-bar blues chord progression, whilst being played in the jazz style, rather than the traditional blues style. Blues music was a major influence in the development of jazz, and such tunes -- "jazz blueses" -- are extremely common in the jazz repertiore. (In addition to the chord progression, jazz players borrowed many other stylistic devices from the blues, such as blue notes, blues-like phrasing of melodies, and blues riffs.) A jazz blues will usually feature a more sophisticated -- or at any rate a different -- treatment of the harmony than a traditional, "blues" blues would, but the underlying features of the standard 12-bar progression remain discernable. One of the main ways the jazz musician accomplishes this is through the use of chord substitutions: a chord in the original progression is replaced by one or more chords which have the same general "sense", or function, but which add a different color, or add some secondary, shorter-term, harmonic movement within the span of the existing overall harmonic movement. An important example of this occurs in the 9th and 10th bars, where the usual blues progression, V  -->  IV,  is almost always replaced by the typical jazz cycle-of-fifths progression  ii minor  -->  V.   The 12-bar blues form, in Bb, often becomes

Where each slash represents a new measure, in the jazz blues. The significant changes include the Edim7, which creates movement, and the iii-VI-ii-V turnaround, a jazz staple.

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