Heller's Opus 46 is a collection of 30 short pieces that explore specific technical and musical skills. Such pieces help pianists develop a strong foundation of sound, color, dexterity and musicality. The 11th piece in this album, often called "Fluttering Leaves", is a study in alternating hands. The main challenge here is for one hand to move to the next position, while the other is playing. This independence and control of the movement of both arms and hands is an essential skill for all developing pianists.