Book, CD & DVD. Sound Innovations for String Orchestra, Book 2 continues your studentÂ's musical journey by teaching with segmented presentation of new concepts and introducing ensemble playing. Isolating concepts and teaching them individually helps facilitate understanding of the more advanced material. Following the unique Sound Innovations organization by levels, the book contains four levels, each of which are divided into several sections that introduce concepts separately and provide plenty of practice and performance opportunities to reinforce each lesson. Visit www.alfred.com/soundinnovations for more information.