I recently tried using quartal harmony and mirror harmony (also known as "negative harmony") together. I was looking for some music theory that would inspire me to do something more unusual than I usually do.
I took the
C major scale, harmonized each scale degree diatonically in 4ths, and then mirrored it. If I may, the end result sounds very jazzy (though I have no idea what jazz is).
Here is the scale, harmonized and then mirrored. I acquired the chord names using software.
Two notes about notation: in the chord names, the "s" stands for suspended and the "M" stands for major, as in
D♭Maj7♭5sus. The "p" and "a" between notes in the harmonizations stand for perfect fourth and augmented fourth, respectively.
Is my resultant chord progression correct? Is this the correct way to harmonize a
C major scale with quartal voicings and then apply the mirror harmony?
I suspect there is an error because the final progression has two pairs of chords with the same root notes,
G♭. That seems strange to me. Could anyone point out if I made a mistake? I am by no means a music theory buff, nor do I have musical talent.