20 Graded and Melodic Exercises (Fairly Difficult) (Vingt Études Progressive et Mélodiques Assez Difficiles pour Clarinette) Book 3 by Paul Jeanjean. Alphonse Leduc, 1929, SS, 39 pages. This book has 20 etudes in the rest of the keys through seven sharps and seven flats. It is primarily the key signatures that make these difficult. (C0965)