In my opinion, soundtrack is one of the most important part of the game.
Long Dark has a beautiful world, which feels more magnificent with this kind of music.

This soundtrack sounds both sad and hopeful, for example, "There's Something I Have to Say" gives you a bit sad feeling, but "Illuminate" gives you relieving feeling.
While some of the musics are short, they are not any lesser than the longer ones.

Music for The Long Dark volume 1 is worth it's cost. I'd say that if you like the Long Dark itself, you should really buy this one too.