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Seventh chords are a type of chord that includes the 7th scale degree (that is, the 7th note of the scale). There are different types of 7th chords such as major 7ths, dominant 7ths, minor 7ths, half diminished 7ths, and fully diminished 7ths. [8] These chords are similar with slight changes, but are all centered around the same key center.
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]
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]
This is a plagal cadence featuring a dominant seventh tonic (I or V/IV) chord. However, Baker cites a turnaround containing "How Dry I Am" as the "absolutely most commonly used blues turnaround". [5] Fischer describes the turnaround as the last two measures of the blues form, or I 7 and V 7, with variations including I 7 –IV 7 –I 7 –V 7. [6]
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.
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A guitarist performing a C chord with G bass. In Western music theory, a chord is a group [a] of notes played together for their harmonic consonance or dissonance.The most basic type of chord is a triad, so called because it consists of three distinct notes: the root note along with intervals of a third and a fifth above the root note. [1]