I got one!
French film, early ninties. Part one of a trilogy.
A woman is in a car wreck, and her husband and child die. She survives, and has to deal with coping with it. She helps finish her husband's last symphony, and finds out another woman is pregnant with her husbands child because he was sleeping with her. It's part of an 80 dollar Criterion set featuring the other two films.
This movie will make you feel very "blue" when you watch it.