Realistic concert piano

Going forward it would be a nice PhD for someone to make an AI 
expressive concert player for piano.
input: midi notes + sheet music annotation;
output: audio
Success: 95% can't tell the difference between real and AI.

Things like expression and phrasing are important. So once coded up 
might even be able to tune a personality, or do an exact copy of an 
existing pianist.

Don't expect learning from a recording is up to it, but a high end 
keyboard capturing all the input for training should be OK.

Audio output is pretty good already, with physics simulators etc.

The whole thing might exist already, not in that particular loop.