These delightful etudes by Ernesto Kohler (Op.33) have endless benefits for an intermediate player.Each one succinctly addresses a particular idea - be it articulation phrasing or an expressive gesture - consistently throughout the etude. Thus their intention is focused and due to their brevity a student can be assigned two to four a week. Consequently the rewards are great!Book 1 contains exercises No. 1 to 15.