Rating: WORTHY!
I recommend this one from Scholastic, which aims to teach the instruments of the orchestra and elsewhere - facilitated with a map showing different kinds of music on different continents. As other books in this series, it is full of attractive and illustrative images, and it offers a really good and useful basic grounding in musical instruments for young children.
There's a page showing how music is annotated, so you know the score, a page showing how an orchestra is arrayed radially and radiantly, and a page of stickers for children to apply in applicable locations throughout the book, so you'll stick with it. A wealth of information suitable for the child's mind so they can see sharp and not be flat. Not to harp on it, but recommend this one to stave off boredom and cause the scales to fall from your kid's eyes! Make a note. This could be key to your child's education!
