I don't want to diminish the author's effort here, but this system feels like it would have difficulty beyond basic cases. And, in the most basic cases, it does

I don't want to diminish the author's effort here, but this system feels like it would have difficulty beyond basic cases. And, in the most basic cases, it doesn't offer much more than simply calling out the chords over the lyrics. It does lead me to think that a simple piano roll layout, like the ones found in Logic and other digital audio workstations, would be useful for those of us who are terrible at sight reading music.