Book 4 in this series introduces new concepts such as: new time signature 6/8; relative minor scales; key signatures for major and minor scales; primary triads and the dominant 7th; subdominant and dominant 7th chords; authentic, plagal, and half cadences; among others. Students are presented with a final test at the end of this book to demonstrate their knowledge of concepts presented in this level. Includes audio tracks to reinforce every unit,...