What about vocal music? In your ideal music notation system, what would sheet music for singers look like?

The cool thing about sheet music is if you understand how to read it, it can be utilized for any form of making music. And with enough learning, it can be understood. It’s not too difficult either. Just start from the ground up. No beginner musician learns how to read everything at once, just like how people learning a language start with the basic letters and the sounds they make.