Reply To: Music, maths and language
I love The Phantom Tollbooth! And it had personifications of everything we are talking about here- the Mathemagician for math, Aazz the Unabridged who rules over the land of words, Faintly Macabre the not-so-wicked Which… I think you might be thinking of Chroma, who would conduct an orchestra that would play the sunrise. Instead of playing music they played colored and made the world visible, not just black and white outlines of things.
When I taught first grade I read the entire book to the kids over the course of around 2 months, a little every afternoon if they had finished their work. Read it to my own kids growing up too.