Yesterday or the day before. I don't know. At about five years old, I started playing harmonica. Taking lessons and learning all the notes. And I'd go humm.
Most kids learn to play music completely disassociated from school.
They learn in another place. The elementary school system has almost no business trying to teach music. In a recent Rolling Stone article they said some things about you. Let me quote some of them to you. He revels in the idea of taking refuge.