Disklavier

I will be giving a demonstration of a program that I wrote that 
attempts to make the process of converting a standard MIDI file to a 
file for an antique reproducing piano. The idea is to make the 
process a little less painful by recognizing some of the velocity 
changes and generating the appropriate expression control codes 
autolmatically. 

I was hoping to find a couple of good piano solo performances for the 
demonstration and specifically wanted to use "Summertime" from "Porgy 
and Bess" and also "All That Jazz" from "Chicago" since I will be 
giving the demo in Chicago. I have spent hours downloading files from 
the internet and any of the good ones are highly orchestrated and 
would take a lot of work to reduce to piano solo. All of the piano 
solos I have found are terrible or worse, metrically arranged 
performances that sound like first week piano students playing.

I have no problem paying for the files but have no idea where to 
look. I would also be interested in trading if anyone has a recording 
that they have made. I want recordings (MIDI piano only) that sound 
like high quality live performances, not metrically arranged crap. I 
don't have the time to find a pianist and make a new recording. There 
must be some good ones already.