My rating: 2 of 5 stars
Even on the official Groovy Joe website, this book does not appear to exist, though it does have it's own song recording. This book came with my daughter's Scholastic book club order for the month. It's a cute story following a tune that's all about building a rainbow, each page or spread focusing on 1-2 colors being added. Likewise, each color also adds a new instrument in a corresponding color. The song builds on itself until all the colors are added. I can see the practical application especially for young students who are still learning. Not overly exciting for the adults though.