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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. Mastery of the blues and rhythm changes are "critical elements ...
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]
Guitar chord. Ry Cooder plays slide guitar using an open tuning that allows major chords to be played by barring the strings anywhere along their length. In music, a guitar chord is a set of notes played on a guitar. A chord's notes are often played simultaneously, but they can be played sequentially in an arpeggio.
The Piedmont blues was named after the Piedmont plateau region, on the East Coast of the United States from about Richmond, Virginia to Atlanta, Georgia.Piedmont blues musicians come from this area, as well as Maryland, Delaware, West Virginia, Pennsylvania and northern Florida, western South Carolina, central North Carolina, eastern Tennessee, Kentucky, and Alabama – later the Northeastern ...
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.
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]