Say that you an “out-of-the-ordinary” progression that involves a bunch of major triads going up by whole steps.
So, that would be: C – D – E – F# …
This parallel movement is irregular because there is no “standard” key that has more than two major chords a whole step apart in a row.
However, you can make the progression sound really amazing by using sus4 chords in between.
To remind: a sus4 chord is when you replace the third of a triad with a P4 interval above the root.
By altering each chord to become a sus4 voicing, you create a chromatic line ascending upwards that makes the chord progression become more interesting and flowing:
Try it out on your own with different major chords.
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