This book is designed as a workbook to teach theory specifically relevant to the cello at a level that is attainable and challenging, yet fun for young children. It is intended to build confidence and solidify the relationship between theory and playing. Children will enjoy the drawing and colouring activities in the book, while developing the fundamentals of cello theory at the same time. The book can be used to teach beginners the basics of theory, or even to refresh musicians who might need a small review of cello theory. No matter who uses this book, it will give a strong foundation to cello theory, and through this understanding will foster a greater love of playing. Concepts covered in this book include: learning the parts of the cello; learning about line and space notes; learning musical symbols; and how to draw music.