In ERNESTO KÖHLER's most popular educational work, Der Fortschritt im Flötensplel (The Progress in the Art of the Flute), one finds all the qualities for which Köhler was appreciated by many flutists of his time. In this second revised and recomposed volume, his melodic spontaneity and the quality of his composition reemerge. Köhler thus manages to reconcile the pleasure of playing with the progressive work on articulation, the linking of difficult intervals, and the understanding of complex musical forms.