I’ve tried searching the IMDB and soundtrack.net, but didn’t find anything. Of course, not all songs that are in a movie are always listed on the soundtrack.
The piece in question is the second movement of Bach’s Harpsichord Concerto No. 5 (BWV 1056). I recall it played on a piano. I know it’s pretty similar to the more-famous Sinfonia of BWV 156, but that’s not what I’m looking for.
Here’s a recording, played a bit slower than I recall being used in the movie.
Very pretty and a great selection, though I never saw Hanna And Her Sisters. I’m more of a Beethoven kinda-guy when it comes to the classics, but I admit I need to check out some Bach as well.
That’s it! The Glenn Gould recording really seemed like the one I remembered, too. (Also should have noticed the Youtube comments; I was just looking for a way for people to identify it). On edit: I suppose I should have clarified that only the harpsichord part was played on piano, not the orchestra part as in the Youtube video I linked.