know which keyboard performers played Mozart's compositions in the
film "Amadeus"?
http://www.amazon.com/exec/obidos/ASIN/B00003XAVS/internetmoviedat/102-8769322-9623312
says the keyboard performances on the soundtrack are by Alfred Brendel.
(And orchestral by Academy of St. Martin-in-the-fields, Neville Warriner.)