Progressive Duets This is a comprehensive publication of fifty-two graded duets. Clark has drawn on his extensive experience as a school music teacher and a prominent composer / arranger to create a collection of duets that will be useful in a variety of performances. Playing duets is an excellent way for the student to build ensemble skills with a colleague or teacher. This collection is a welcome addition to repertoire that will provide players with refreshing new duets. It is a collection that is long overdue.