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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.
Minor Irregular resolution (Type I: Two common tones, two note moves by half step motion) V7–III7: 2: Major Montgomery–Ward bridge: I–IV–ii–V: 4: Major Omnibus progression: Omnibus progression.? Major Pachelbel's Canon: I–V–vi–iii–IV–I–IV–V: 5: Major Passamezzo antico: i–VII–i–V–III–VII–i–V–i: 4: Minor ...
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, V–IV–I–I. By thinking of this blues progression in Roman numerals, a backup band or rhythm section could be instructed by a bandleader ...
However, since blue notes are considered alternative inflections, a blues scale may be considered to not fit the traditional definition of a scale. [6] 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]
The blue notes are usually said to be the lowered third, lowered fifth, and lowered seventh scale degrees. [1] [2] [3] The lowered fifth is also known as the raised fourth. [4] Though the blues scale has "an inherent minor tonality, it is commonly 'forced' over major-key chord changes, resulting in a distinctively dissonant conflict of ...
[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.
In contrast, in the chord-scale system, a different scale is used for each chord in the progression (for example mixolydian scales on A, E, and D for chords A 7, E 7, and D 7, respectively). [5] Improvisation approaches may be mixed, such as using "the blues approach" for a section of a progression and using the chord-scale system for the rest. [6]
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.
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