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It is a recognised fact that the greatest composers were likewise the greatest virtuosos; but did they play like the pianists of the present day, who run up and down the keyboard with passages studied beforehand? Pooh! pooh! pooh! Don't tell me! A real virtuoso, when extemporising, plays pieces which hold together and possess a form. Were the ideas in them fixed instantly on paper, they would be taken for pieces written at leisure. That is what I call playing the piano; everything else is a bad joke.
— LUDWIG VAN BEETHOVEN