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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]
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.
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 ...
The standard 12-bar blues form is noted in uncorroborated oral histories as appearing communities throughout the region along the lower Mississippi River during the decade of the 1900s (and performed in New Orleans at least since 1908). One of these early sites of blues evolution was along Beale Street in Memphis, Tennessee.
This 12-bar blues song, written by Tulsa western swing bandleader Johnnie Lee Wills and steel guitarist Deacon Anderson, was published in 1949. Considered a novelty song, the lyrics consisted mostly of spelling out the title of the song; because of the spelling used in the song, it is sometimes referred to as "Ragg Mopp".
Handy later rewrote the tune and changed its name from "Mr. Crump" to "Memphis Blues." The 1912 publication of the sheet music of "The Memphis Blues" introduced his style of 12-bar blues; it was credited as the inspiration for the foxtrot by Vernon and Irene Castle, a New York dance team. Handy sold the rights to the song for $100.
Peterson thought of Charlie Parker’s exuberant 12-bar blues “Relaxin’ at Camarillo.” It was more than a standout tune to him — it was a code: Camarillo was the state mental hospital where in the 1940s Parker had been sent to address his own heroin addiction.
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. board