From the Publisher
One of the most widely used series of methods for individual or like-instrument class instruction. Using a very well-rounded approach including scales, arpeggios, technical studies, studies for musicianship, articulation studies, solos, duets, and studies devoted to the special needs of each instrument, this series provides a fantastic wealth of material for all student musicians.
Difficulty level, roughly compared to ABRSM exam grades. 0 is beginner, 9 is advanced (beyond grade 8).