Composition and Analysis With The Axis System
It may be noted that each of the above notes forms a descending diminished chord. In the case of I or C, C-A-F♯-D♯, or an E♭ fully diminished chord. This connects the axis system not only with diminished chords, which often form the basis for the movement in a piece based on the axis system, but also links the axis system with the diminished scales formed on ♭III of each of the principal tones: root, subdominant, and dominant.
The axis system is probably used more in analysis, and less in composition. Uses of the system have a characteristic sound, but that sound is similar to that which can be found in uses of tritone Dominant Substitutions, and Deceptive Cadences using the ♭VII dominant chord. Older systems of harmonic theory segue very easily into the axis system.
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