As the film has a much more sad tone, we wanted slower, hauntin music and thought that simple piano tracks would fit very well.
Here are some tracks I have considered:
A piano cover of Tchaikovsky's Swan Lake. The music is public domain, so we are allowed to use it.
I also found some tracks on a royalty free music site which I quite liked.
This one and the following aren't piano pieces but feel quite eerie and fit well with the narrative/
This last one does have a little bit of a pinano at the start and feels quite eerie too, but it also seems childish, fitting very well with the themes of the film/