5Essential Music Theory is a set of music theory books that cover all aspects of theory essential to a students musical growth. This series covers rudiments, history, harmony and counterpoint. These books are a great way to prepare for examinations and support the practical lesson, giving students a well rounded musical education. Helpful diagrams and images accompany each lesson and combine with a variety of engaging learning activities to reinforce essential skills and knowledge. This book contains the answer key to level 9.