Relation with Major Scale: It is a variation of the Ionian (major) scale, where the second degree is augmented by a semitone.
Theoretical Aspects
Sound Character: Maintains the bright character of the major scale, but the augmented second adds an exotic and unpredictable color that makes it more expressive and less predictable.
Typical Chord: Maj7♯9
Modal Context: Used in contexts where one wishes to enrich a major chord with melodic tension, especially in fusion music or modal jazz.
Harmonic Use: Applies to melodic passages on major-type chords with tensions, especially in static modal progressions.
