30 Great Exercises or Studies (Trente Grands Exercices ou Etudes) for All Saxophones after Soussmann Book 1 by Marcel Mule. Alphonse Leduc, 1944, SS, 31 pages. These advanced pieces are more exercises than etudes (many feature short phrases repeating through the range of the instruments and in different keys). Book 1 has 15 exercises starting in C and moving through the circle of fifths in major and minor sharp keys.