Tone clusters...on the piano whole scales of tones used as chords, or at least three contiguous tones along a scale being used as a chord. And, at times, if these chords exceed the number of tones that you have fingers on your hand, it may be necessary to play these either with the flat of the hand or sometimes with the full forearm. This is not done from the standpoint of trying to devise a new piano technique, although it actually amounts to that, but rather because this is the only practicable method of playing such large chords. It should be obvious that these chords are exact and that one practices diligently in order to play them with the desired tone quality and to have them absolutely precise in nature.