Beschreibung
This etude was written to assist learning trills. There is a known exercise: playing a trill slowly as a triplet (for example, C-D-C D-C-D C-D-C D-C-D), and, gradually increasing speed. The etude is built on this exercise. Recommended fingering is shown.
The etude sounds quite impressive if played fast (see the audio example), but is actually quite easy to play at slower speed.