Deckman, I hate to be pedantic just as much as I dislike introducing thread creep, but I don't think "Buttons and Bows" can be played on the black keys.

"............rings and things and buttons and bows ......"

There is a semitone difference between "butt...." and ....tons" when you sing "buttons" in that line, therefore it could not be played on the black keys and isn't really a pentatonic melody.

That apart, your contributions to this thread are magnificent.

Murray