[gnud]

It's a fine article, but not a fine introduction. I read more as a list of all the things the author didn't understand (or pretended not to understand), because they couldn't describe them mathematically.

I assume it's written partly tongue-in-cheek, to show how arbitrary a lot of music tradition is, and how it creates a barrier to entry.

And the article didn't even mention different clefs or transposing instruments!