40 Graded Clarinet Duets (Grades 1-5). Keri Degg PDF Email Edition 40 Graded Clarinet Duets (Grades 1-5). Keri Degg PDF Email Edition 40 Graded Clarinet Duets (Grades 1-5). Keri Degg PDF Email Edition 40 Graded Clarinet Duets (Grades 1-5). Keri Degg PDF Email Edition Forty original duets for Clarinet in a variety of styles from ragtime to swing, contemporary to counterpoint. Hidden technique workouts to advance your skills. Eight of each (grades 1 through to 5). £8.99 Quantity: at £8.99 each Add To Basket