When composers wrote for these instruments they sometimes loved them and sometimes chafed at their limitations, but in any case they wrote for those sounds, that touch, those bells and whistles. From old instruments, performers on modern pianos can get important insights into the sound image that Mozart, Schubert, et al., were aiming for. But music from the 18th and 19th centuries doesn't just sound different now than on the original instruments; some of it can't even be played as written on modern pianos. One example is the double-octave glissando in the last movement of Beethoven's "Waldstein" Sonata. With the light action and shallow key dip of a period Viennese piano you can plant your thumb and little finger on the octave and slide to the left, and there it is. Given the much heavier action and deeper key dip of a modern piano, if you tried that today you'd dislocate something. Every pianist has a dodge for that passage. It's said that before the glissando Rudolf Serkin would discreetly spit on his fingers.
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http://www.slate.com/articles/arts/m...st_sounds.htmlLudwig van Beethoven
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Yes I know all about those glissandi in the Waldstein! Beethoven also used them in the first movement of the 1st piano concerto just before the recapitulation.'Man know thyself' -
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