Charles-Louis Hanon
Exercise One (Stretch between the fifth and fourth fingers)
Overview
The Virtuoso-Pianist. Part I. Preparatory Exercises for the Acquirement of Agility, Independence, Strength and Perfect Evenness in the Fingers. No 1. Stretch between the fifth and fourth fingers of the left hand in ascending, and the fifth and fourth fin- gers of the right hand in descending. For studying the 20 exercises in this First Part, begin with the metronome set at 60, gradually increas- ing the speed up to 108; this is the meaning of the double metronome-mark at the head of each exercise. Lift the fingers high and with precision, playing each note very distinctly. (M.M. 60 to 108.) (1) For brevity, we shall henceforward indicate only by their figures those fingers which are to be specially trained in each exercise; e. g., 3-4 in No 2; 2-3-4 in No 3, etc. Observe that, throughout the book, both hands are continually executing the same difficulties; in this way the left hand becomes as skilful as the right. Besides, the difficulties executed by the left hand in ascending, are exactly copied by the same fingers of the right hand in descending; this new style of exercise will cause the hands to acquire perfect equality. As soon as Ex.1 is mastered, go on to Ex.2 without stopping on this note.（Source）
