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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.
The Blues for Alice changes, Bird changes, Bird Blues, or New York Blues changes, is a chord progression, often named after Charlie Parker ("Bird"), which is a variation of the twelve-bar blues. The progression uses a series of sequential ii–V or secondary ii–V progressions, and has been used in pieces such as Parker's " Blues for Alice ".
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. Sometimes the V 7 chord is used instead of V, for greater tension.
[36] [37] For example, a twelve-bar blues progression of chords in the key of E has three sets of four bars: E–E–E–E7 A–A–E–E B7–A–E–B7; this progression is simplified by playing the sevenths as major chords. [36] The twelve-bar blues structure is used by McCartney's "3 Legs", [32] which was noted earlier.
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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. In the composition's original key of G this chord is an E ♭ 7. "All Blues" is an example of modal blues in G Mixolydian. [2] [clarification needed]