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A major feature of the blues scale is the use of blue notes—notes that are played or sung microtonally, at a slightly higher or lower pitch than standard. [5] However, since blue notes are considered alternative inflections, a blues scale may be considered to not fit the traditional definition of a scale. [6]
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]
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.
E major is a major scale based on E, consisting of the pitches E, F ♯, G ♯, A, B, C ♯, and D ♯. Its key signature has four sharps. Its relative minor is C-sharp minor and its parallel minor is E minor. Its enharmonic equivalent, F-flat major, has six flats and the double-flat B, which makes that key less convenient to use. The E major ...
The blues scale is so named for its use of blue notes. Since blue notes are alternate inflections, strictly speaking there can be no one blues scale, [8] but the scale most commonly called "the blues scale" comprises the minor pentatonic scale and an additional flat 5th scale degree: C E ♭ F G ♭ G B ♭ C. [9] [10] [11]
If two chords are in the box they are each played for half a bar, etc. The chords are represented as scale degrees in Roman numeral analysis. Roman numerals are used so the musician may understand the progression of the chords regardless of the key it is played in. "Eight-bar blues chord progression": [10]
In the minor mode, a common borrowed chord from the parallel major key is the Picardy third. In the major mode, the most common examples of borrowed chords are those involving the ♭, also known as the lowered sixth scale degree. These chords are shown below, in the key of C major. [8]
In jazz music, on the other hand, such chords are extremely common, and in this setting the mystic chord can be viewed simply as a C 13 ♯ 11 chord with the fifth omitted. In the score to the right is an example of a Duke Ellington composition that uses a different voicing of this chord at the end of the second bar, played on E (E 13 ♯ 11).