Say that you an “out-of-the-ordinary” progression that involves a descent of minor triads by whole steps.
So, that would be: Cm – Bbm – Abm – Gbm …
This parallel movement is irregular because there is no “standard” key that has more than two minor chords a whole step apart in a row.
However, you can make the progression sound really amazing by using sus2 chords in between.
To remind: a sus2 chord is when you replace the third of a triad with a M2 interval above the root.
By altering each chord to become a sus2 voicing, you create a chromatic line descending downwards that makes the chord progression become more interesting and flowing:
Try it out for yourself starting at different minor triads.
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