dozens of midi files recorded by classical pianists on a Yamaha Disklavier.
I'm having way too much fun feeding these into my sampled piano.
Also, I think these files would be great for comparing sampled pianos. You would be able to judge how they respond to a master pianist's touch and if they can capture the sublties introduced in the performers' precise use of the sustain and soft pedals. There's a reason they use 40% pedal as opposed to 60% pedal ; it sounds different!
Also, anyone who wants to make The Jesus sampled piano would implement arbirarty soft-pedaling, hammer velocity, key-on velocity, and key-off velocity, all of which are recorded into the MIDI files