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First, technical perfection as something natural. Second, an insight into the development of the piano sound, as perfected by the pianist-composers of the late 19th and early 20th centuries, composers who understood the piano both as a human voice ... and as an orchestra with which they could produce a variety of colors. Third, the need to learn how to use every aspect of our new instruments, which are richer in sound. Fourth, the importance of differentiation.