I have never had an interest in rendering existing MIDIs until now. The recent posts of Rachmaninoff and Fats Waller peaked my interest and I discovered some interesting treasures on the web. I guess being a history enthusiast has a lot to do with it.
These MIDIs are derived from piano rolls. At the turn of the 20th century "player piano" recording technology had evolved to the point that those instruments could record expressive parameters such as dynamics, precise note duration, pedal, etc. Playback was an exact replica of the performance. In the early 20th century many notable pianists recorded their performances for posterity. As it turns out, these rolls can be easily scanned and converted to MIDI format.
Here are a few MIDIs I think you might find interesting. All of these were rendered with the Garritan Authorized Steinway using the Underlid perspective.
George Gershwin playing his Rhapsody in Blue
Percy Grainger playing two selections from Greig's Peer Gynt Suite Recorded Apr 1922
Arthur Rubenstein playing Schumann's Papillons, Op 2 Recorded Oct 1922
Ferruccio Busoni playing Chopin's Prelude, Op 28, No 23 Recorded 1927
Rachmaninoff playing his arrangement of Moussorgsky's Hopak Recorded 1920
Eubie Blake playing his Rhapsody in Ragtime and I'm Just Wild About Harry
These piano roll MIDIs and over 5000 others can be found at http://members.shaw.ca/smythe/archive.htm