What is the name of the song played in the movie "The Box"?

I've watched the movie several times, and I can't seem to get this
song out of my head. It's played by a piano in the beginning, and
later the full orchestra comes in. The song I'm looking for is really
sad, and it has no words, just instruments, and it's repeated twice
within the movies. Once when Cameron Diaz, and her husband are getting
ready for a party, and the other I believe it is played towards the
end. Thanks in advance for all of your help!