The final prelude on my Blue Pool CD explores overtones that resonate above the open strings in slack key tunings. More felt than heard, these overtones help create the rich characteristic sound of slack key music. In this piece, I bring these upper resonances "down to the "surface," so to speak, and merge them with conventional slack key chords to form hybrid harmonies that are subtle and beautiful in their own right. Uncovering these harmonies was what I was ultimately after in writing classical guitar pieces inspired by slack key. I demonstrate how this all works in the video below.