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In jazz theory, an avoid note is a scale degree which is considered especially dissonant relative to the harmony implied by the root chord, and is thus better avoided.. In major-key tonality the avoid note is the fourth diatonic scale step, or 11th, which is a minor ninth above the 3rd of the chord, and thus very harsh. [1]
An avoid note is a note in a jazz scale that is considered, in jazz theory and practice, too dissonant to be emphasised against the underlying chord, and so is either avoided, used as a passing tone or chromatically altered. [3]
The term side-slipping or side-stepping has been used to describe several similar yet distinct methods of playing outside. In one version, one plays only the five "'wrong'" non-scale notes for the given chord and none of the seven scale or three to four chord tones, given that there are twelve notes in the equal tempered scale and heptatonic scales are generally used. [3]
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]
As it contains the notes and alterations (I, ♭ 9, m3/ ♯ 9, M3, ♭ 5/ ♯ 11, ♭ 13, m7), it is particularly important in the jazz harmonic idiom, notably as a V chord in a minor key. For our example key of C-minor, the V chord is G7, so the improviser would draw upon the G7 altered scale (mode VII of the A ♭ melodic minor). A complete ...
"The number of the notes that make up a scale as well as the quality of the intervals between successive notes of the scale help to give the music of a culture area its peculiar sound quality." [6] "The pitch distances or intervals among the notes of a scale tell us more about the sound of the music than does the mere number of tones." [7]
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