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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]
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.
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.
The exception is well-known progressions (e.g., 12 bar blues) and jazz standards such as "I Got Rhythm", known colloquially as "rhythm changes". For well-known progressions, the bandleader may simply say "solos on blues changes" or "solos on rhythm changes", and the comping musicians are expected to be familiar with these chord progressions.
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 form and chord progression are based on the standard twelve-bar blues in the key of B minor, with the vocal melody and nearly all of Gilmour's soloing based on the pentatonic and blues scales. [12] Two twelve-bar verses are followed by a twenty-bar instrumental section that features a blues-style tenor saxophone solo played by Dick Parry ...
"All Blues" is a jazz composition by Miles Davis first appearing on the influential 1959 album Kind of Blue. It is a twelve-bar blues in 6 8 ; the chord sequence is that of a basic blues and made up entirely of seventh chords , with a ♭ VI in the turnaround instead of just the usual V chord.
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.