One of my teachers collaborates frequently with living composers to play new music. She will often divert from the written score directions according to the circumstances of the performance. One may think this ticks off the composer, however, the composers are usually very pleased with the changes.
Arthur Rubinstein used to do so. I never understood why a colleague told me (we're both students back then) that I played appassionata like Rubinstein until I went to play the piece in a masterclass and the maestro got really upset because my playing was nothing like what Beethoven wrote (and I had the UE wienner urtext edition). When I get home I got my cds and started comparing the piece; I listen to Barenboim, Richter, Gilels, Pollini, etc... when I got to Rubinstein I was shocked to discover that EVERYTHING I did "wrong" was exactly was Rubinstein was doing and that was completely different to the sheet music. Horowitz and Cortot used to make markings of their own as well; and Rachmaninoff, everything he played sounded like Rachmaninoff!!!
Neither Rubistein or Rachmaninov played things really completely different did they? Like playing in a presto tempo when it says largo etc. I know that Gould plays everything completely different on some recordings and Pogorelich plays Largo when it says Presto pretty often these days.
Then we have a different understanding on what "completely different" means. Rubinstein made up performance marks and tempo changes that were not indicated by the composer. Why you'd think Rachmaninoff played pieces according to the sheet music is beyond me. About Gould, I guess you're referring to the Brahms concerto, however most of the changes he made on the pieces he played were based closely on textual analysis and research. Probably my concept of what "completely different" is might be too subtle, sorry.
Give a good example of Rach playing completely different then the composers markings.
Gouldīs Mozart and Chopin recordings almost sound like he plays from a score where there is nothing but the notes sometimes. No tempoindications or anything. Give a good example of Rach playing completely different then the composers markings.