Okay, in the Voyager episdoe "Human Error" (the one where 7 of 9 plays around in the holodeck and pretends to be human)

What is the name of the piece that 7 is playing?! I know that it is probably by Chopin...

See, I know just about every piece of classical music that is played in TNG and Voyager... and this is the only one that I don't know. Please, help!