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The twelve-bar blues (or blues changes) is one of the most prominent chord progressions in popular music. The blues progression has a distinctive form in lyrics, phrase, chord structure, and duration. In its basic form, it is predominantly based on the I, IV, and V chords of a key.
In 1963, Amiri Baraka, then known as LeRoi Jones, was the first to write a book on the social history of the blues in Blues People: The Negro Music in White America. The British and blues musicians of the early 1960s inspired a number of American blues rock performers, including Canned Heat, Janis Joplin, Johnny Winter, the J. Geils Band, Ry ...
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 ...
Little is known about the exact origin of the music now known as the blues. [1] No specific year can be cited as its origin, largely because the style evolved over a long period but blues is inarguably a Black American art form as it is noted "it is impossible to say exactly how old blues is - certainly no older than the presence of Negroes in the United States.
Eight-bar blues progressions have more variations than the more rigidly defined twelve bar format. The move to the IV chord usually happens at bar 3 (as opposed to 5 in twelve bar); however, "the I chord moving to the V chord right away, in the second measure, is a characteristic of the eight-bar blues." [1]
A common type of three-chord song is the simple twelve-bar blues used in blues and rock and roll. Typically, the three chords used are the chords on the tonic , subdominant , and dominant ( scale degrees I, IV and V): in the key of C, these would be the C, F and G chords.
Here, the twelve-bar progression's last dominant, subdominant, and tonic chords (bars 9, 10, and 11–12, respectively) are doubled in length, becoming the sixteen-bar progression's 9th–10th, 11th–12th, and 13th–16th bars, [citation needed]
Although Delta blues certainly existed in some form or another at the turn of the twentieth century, it was first recorded in the late 1920s, when record companies realized the potential African-American market for "race records". The major labels produced the earliest recordings, consisting mostly of one person singing and playing an instrument.