The Belwin Student Instrumental Course is a course for individual instruction and class instruction of like instruments, at three levels, for all band instruments. Each book is complete in itself, but all books are correlated with each other. Although each book can be used separately, all supplementary books should be used as companion books with the method. Piano Acc. Book to be used with Duets Level I, for Flutes, Clarinets, Alto Saxophones, Cornets and Trombones.