> A kid can learn the notation for whole, 1/4, 1/8, etc. musical notes and their positions on the staff very easily. An immediate relationship is created to the key on the piano or the fret on the guitar
I don't know about that. How many people can read music?
But also music, much like Chinese and Japanese is at a comparative disadvantage compared to math because there are no other tools to explain how high or low a note is.
You can use words to explain math, just like you did with your son.
Internalization is key, if you miss the window as a kid then it's gonna be an uphill battle and life being complicated as it is would mean people giving up on it.
And real world feedback is telling us that such window will be missed, that's why I had thought about math being always explained using the familiar English language which is almost always never missed as a kid.