Classical question

In the movie "Francis" the Francis Farmer story starring Jessica Lange they play a wonderful classical piece at the end during the closing credits. I have never been able to find out who the composer is. I would dearly like to buy a CD with this tune on it. If you could enlighten me I would be very grateful. Thanks.

I have found music lists on the web of the Soundtrack and the only classical listed is Mozart's k313 I believe which is actually played during the movie itself and is not the one I'm looking for.