This makes me wonder if in spite of all these years of education by play, Elementary Piagetian* education is still overlooking mental methods of arithmetic that

This makes me wonder if in spite of all these years of education by play, Elementary Piagetian* education is still overlooking mental methods of arithmetic that musicians use. Musicians have an easy time understanding structure - and also knowing how to learn by repetition (to tell a student to repeat something is often a task in itself)! * https://en.wikipedia.org/wiki/Piaget%27s_theory_of_cognitive_development https://en.wikipedia.org/wiki/Piaget%27s_theory_of_cognitive...