New keys and rhythms are introduced in this book, which can be used in a sequential or flexible format. New keys and rhythms are introduced in this book, which can be used in a sequential or flexible format. The CD includes play-along tracks for the student that feature real players playing real instruments (not synthesized). Book 2 also features large, clear fingering charts, mixed meter studies, comprehensive scale and arpeggio pages, double stops, and shifting exercises.