In fact, the keyboard ought never to be struck hard at all in legato passages or in melody of any kind. On the contrary, the keys must be caressed with a sort of almost stroking movement, to obtain the requisite tone-values. And in connection with this there is another thing to which I attach great importance, namely, that the hand in its attitude on the keyboard should reflect in some degree the spirit of the music.
For instance, it would not be natural to hold the hands as formally when playing Chopin as in the performance of sixteenth century music. Again, in a vivacious piece the hands should look sprightly and full of energy, while in slow cantabile movements they should present a soft and sinuous appearance. For even the fact of the hand looking hard and stiff during playing will assuredly affect the sound adversely, and rob it of beauty of quality.
All these things are intimately connected with the preparation of a fine touch upon the piano. The word “touch,” as a musical term, signifies really the mode by which the fingers attack the keyboard. For the great difficulty to be contended with on the piano when it is necessary to produce a singing tone lies in this, that by its mechanical composition, if once a key is struck upon the instrument, no further modification of the sound-quality is possible. No vibrato or mellowing of the tone can be afterwards applied as on stringed instruments; with the piano, all is over when the ringer has once fallen and the hammer has struck the strings.
Therefore anything that can be done to sweeten the tone must be attempted before the striking of the note. By this I mean that an infinitesimal time should elapse between the action of lifting the finger to strike and the definite falling of the finger upon the key. Touch must be thus prepared in the playing of all melody and singing passages with a slow pressing movement of the hand and fingers. This caressing touch could not, of course, be employed in rapid difficult passages, where direct quick blows of the fingers are indispensable in order to save time. In such cases, and in the higher development of technical brilliance, no more lifting of the fingers is necessary than is compatible with distinct articulation.

