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As the chords of a 12-bar blues follow a form, so does the melodic line. The melodic line might just be the melody of the piece or it might also include lyrics. The melody and lyrics frequently follow an AA'B form, meaning one phrase is played then repeated (perhaps with a slight alteration), then something new is played. [14]
At its most basic, a single version of this blues scale is commonly used over all changes (or chords) in a twelve-bar blues progression. [7] Likewise, in contemporary jazz theory, its use is commonly based upon the key rather than the individual chord. [2] Greenblatt defines two blues scales, the major and the minor.
In rock and blues, musicians also often refer to chord progressions using Roman numerals, as this facilitates transposing a song to a new key. For example, rock and blues musicians often think of the 12-bar blues as consisting of I, IV, and V chords. Thus, a simple version of the 12-bar blues might be expressed as I–I–I–I, IV–IV–I–I ...
In a jazz context, when "blues" or "solo on blues" appears at the start of a solo section, it is an abbreviation for "blues progression"; it instructs the performer to improvise solos over a 12-bar blues progression based on I, IV, and V7 chords. The term "blues" also refers to a style of soloing and playing over this type of progression.
The blues' 12-bar structure and the blues scale was a major influence on rock and roll music. Rock and roll has been called "blues with a backbeat"; Carl Perkins called rockabilly "blues with a country beat". Rockabillies were also said to be 12-bar blues played with a bluegrass beat.
The 12-bar blues were well known in the city before most of the rest of the country. Buddy Bolden's band was remembered at excelling on playing blues before 1906. Anthony Maggio's "I Got the Blues" was an early example of published blues sheet music from 1908.
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"Freddie Freeloader" is a composition by Miles Davis and is the second track on his 1959 album Kind of Blue. The piece takes the form of a twelve-bar blues in B ♭, but the chord over the final two bars of each chorus is an A ♭ 7, not the traditional B ♭ 7 followed by either F7 for a turnaround or some variation of B ♭ 7 for an ending.
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