Search for the "Disklavier" or "Yamaha-Keyboard" groups.
Ensure the MIDI file includes CC64 (Sustain Pedal) events, or your piano will sound very "dry." Risks of "Free" Download Sites
Since classical music is no longer under copyright, many enthusiasts have recorded high-fidelity MIDI versions of masterpieces. Sites like or KunstderFuge offer thousands of files.