I recently re-read a book called the Joy of X. One of the chapters dealt with Möbius strips. There was information about somebody who put together a strip where they punched in a song, like they do with those music boxes. When the strip came around and flipped (as Möbius strips do), the holes were inverted leading to another melody where the lower notes were now higher and the higher notes lower. This of course intrigued me, and I found a site online where you could invert midi.
A recent song I wrote, ‘A Minuet to Three’ seemed a prime candidate. I took several inverted sections and used them as a prelude to the song. The first 58 seconds of this song are the verses of the original song inverted. I put some bass guitar and violin/cello over the top and voila (pun totally not intended) – this is how it came out.