I see what you're getting at... I don't think you can create something musical by inverting an existing song, but as a strategy for creating new music, it seems

I see what you're getting at... I don't think you can create something musical by inverting an existing song, but as a strategy for creating new music, it seems like you could create really interesting sounds by playing all of the notes and changing the sound by removing some notes. It seems to be what's happening at about 2:04 in one of the songs linked to the article. https://youtu.be/FfhDzEgYZug?t=2m4s https://youtu.be/FfhDzEgYZug?t=2m4s