Charles-Louis Hanon
Exercise Twenty-One (Exercise for 3-4-5 fingers)
Overview
The Virtuoso-Pianist. Part II Transcendent Exercises for Preparing the Fingers for the Virtuoso Exercises. Observe, that the work done by the 3rd, 4th and 5th fingers of the left hand in the first beat of each meas- ure (A) is repeated inversely by the same fingers of the right hand in the third beat of the same measure (B). (M. M. 60 to 108.) Practise the exercises in Part II, like those in Part I, with the metronome at 60; similarly practise all the follow- ing exercises where the tempo is not indicated, and gradually increase the speed to 108. Wherever a different tempo is required, it will be indicated at the head of the exercise. Having fully mastered this exercise, go on to the next without stopping on this note.（Source）
