So as I am in the process of writing a patent application for a musical instruction tool here, only partially seen at present. I noticed not every note in the musical alphabet had a corresponding key sign associated with it? Did that make the note designation irrelevant or invalid? No, because even though some notes do not have their very own key signs they can nevertheless be referenced as a so named musical note in certain contexts. So you go D# and G# stand tall with your enharmonic bretheren knowing full well the truth of your sonic brilliance!