This book was perfect for my level of musical knowledge. I knew how to read music, and I knew some of the basics. But in these pages, I learned so much that I wanted to know---and much that I didn't even ponder before opening it! I enjoyed playing my way through the lessons, learning tons about music and how it all goes together. It really helped me understand so many music things. For those wanting a crash course on music theory, I highly recommend this one.