[The Hummingbird system] borrows its method of displaying rhythm from piano rolls, showing us the amount of time a note should be held, like GarageBand and other music software. What’s more, it points up for sharps and down for flats, which a demanding violin teacher might do with a pencil. Aside from that, it’s deceptively complicated and requires learning different symbols. How much easier it would be for someone who has never learned music, or lacks a teacher, is questionable.
New systems (and apps) are best when they solve problems, but learning to read Western music notation isn’t a problem that requires a solution. It’s not easy. But like learning to read English, it’s eminently doable, and fraught with fewer variables and exceptions. Reading Western notation—and there have of course been many precursors to what we use now, as well as many alternatives, including Braille and an integer-based system—has also proven to be good for your brain, and we don’t need to simplify it. The current sharp and flat note symbols work fine; you just have to remember them.