Going back to an early topic of borrowed chords and altering a harmony by changing a chord quality to its parallel major/minor – here is another way on how to view it:
Say you have a melody that you want to craft around a single note drone. In this example, the tone used will be E.
So, E what?? E major? E minor? E Dorian mode? E Mixolydian mode?
Well… why not all give them a shot?
With keeping the tone drone constant in the harmonies (either as a chord tone or upper structure tension), try changing each section of the melody to be in a different mode. Below is the example with every measure changing to a different mode corresponding to E as the center tone.
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