A Rule for Memory Exercises: If you wish to strengthen the receptivity and retentiveness of your memory you will find the following plan practical: Start with a short piece. Analyse the form and manner of its texture. Play the piece a number of times very exactly with the music before you. Then stop playing for several hours and try to trace the course of ideas mentally in the piece. Try to hear the piece inwardly. If you have retained some parts refill the missing places by repeated reading of the piece, away from the piano. When next you go to the piano—after several hours, remember—try to play the piece. Should you still get "stuck" at a certain place take the sheet music, but play only that place (several times, if necessary), and then begin the piece over again, as a test, if you have better luck this time with those elusive places. If you still fail resume your silent reading of the piece away from the piano. Under no circumstances skip the unsafe place for the time being, and proceed with the rest of the piece. By such forcing of the memory you lose the logical development of your piece, tangle up your memory and injure its receptivity. Another observation in connection with memorising may find a place here. When we study a piece we—unconsciously—associate in our mind a multitude of things with it which bear not the slightest relation upon it. By these "things" I mean not only the action of the piano, light or heavy, as it may be, but also the colour of its wood, the colour of the wall paper, discoloration of the ivory on some key of the piano, the pictures on the walls, the angle at which the piano stands to the architectural lines of the room, in short, all sorts of things. And we remain utterly unconscious of having associated them with the piece we are studying—until we try to play the well-learned piece in a different place, in the house of a friend or, if we are inexperienced enough to commit such a blunder, in the concert hall. Then we find that our memory fails us most unexpectedly, and we blame our memory for its unreliableness. But the fact is rather that our memory was only too good, too exact, for the absence of or difference from our accustomed surroundings disturbed our too precise memory. Hence, to make absolutely sure of our memory we should try our piece in a number of different places before relying upon our memory; this will dissociate the wonted environment from the piece in our memory.
With Regard to Technical Work: Play good compositions and construe out of them your own technical exercises. In nearly every piece you play you will find a place or two of which your conscience tells you that they are not up to your own wishes; that they can be improved upon either from a rhythmical, dynamical or precisional point of view. Give these places the preference for a while, but do not fail to play from time to time again the whole piece in order to put the erstwhile defective and now repaired part into proper relation to its context. Remember that a difficult part may "go" pretty well when severed from its context and yet fail utterly when attempted in its proper place. You must follow the mechanic in this. If a part of a machine is perfected in the shop it must still go through the process of being "mounted"—that is, being brought into proper relation to the machine itself—and this often requires additional packing or filing, as the case may be. This "mounting" of a repaired part is done best by playing it in conjunction with one preceding and one following measure; then put two measures on each side, three, four, etc., until you feel your ground safely under your fingers. Not until then have you achieved your purpose of technical practice. The mere mastering of a difficulty per se is no guarantee of success whatever. Many students play certain compositions for years, and yet when they are asked to play them the evidences of imperfection are so palpable that they cannot have finished the learning of them. The strong probability is that they never will finish the "study" of them, because they do not study right.
As to the Number of Pieces: The larger the number of good compositions you are able to play in a finished manner, the better grow your opportunities to develop your versatility of style; for in almost every good composition you will find some traits peculiar to itself only which demand an equally special treatment. To keep as many pieces as possible in your memory and in good technical condition, play them a few times each week. Do not play them, however, in consecutive repetitions. Take one after the other. After the last piece is played the first one will appear fresh again to your mind. This process I have tested and found very helpful in maintaining a large repertory.
Play Always with the Fingers—that is, move your arms as little as possible and hold them—and the shoulder muscles—quite loosely. The hands should be nearly horizontal, with a slight inclination from the elbows toward the keys. Bend the fingers gently and endeavour to touch the keys in their centre and with the tips of the fingers. This will tend toward sureness and give eyes to your fingers, so to speak.
The Practice of Finger Octaves: Play octaves first as if you were playing single notes with one finger of each hand. Lift the thumb and fifth finger rather high and let them fall upon the keys without using the wrist. Later let the wrist come to your aid, sometimes even the arm and shoulder muscles, though the latter should both be reserved for places requiring great power.
Where powerful octaves occur in long continuation it is best to distribute the work over the joints and muscles of the fingers, wrists, and shoulders. With a rational distribution each of the joints will avoid over-fatigue and the player will gain in endurance. This applies, of course, only to bravura passages. In places where musical characteristics predominate the player does best to choose whichever of these sources of touch seems most appropriate.
About Using the Pedal: Beware of too frequent and—above all—of long-continued use of the pedal. It is the mortal enemy of clarity. Judiciously, however, you should use it when you study a new work, for if you accustom yourself to play a work without the pedal the habit of non-pedalling will grow upon you, and you will be surprised to find later how your feet can be in the way of your fingers. Do not delay the use of the pedal as if it were the dessert after a repast.
Never Play with a Metronome: You may use a metronome for a little passage as a test of your ability to play the passage in strict time. When you see the result, positive or negative, stop the machine at once. For according to the metronome a really musical rhythm is unrhythmical—and, on the other hand, the keeping of absolutely strict time is thoroughly unmusical and deadlike.