There's a song in Naruto episode 13, around 17:11 when Haku uses Crystal Ice Mirrors. It's really somber.
I have been searching for this forever.
What is the title and the OST of the song?
The song you are looking for is Haku's theme
Haku's theme never made it to an OST, and is therefor an unreleased soundtrack. And judging by how long ago it has been used, I am assuming it will not be released as one either.